<B>Bacillus Calmette-Guerin,</B><DL COMPACT><DD> a strain of attenuated tuberculosis bacilli, used living as a vaccine (BCG vaccine) against tuberculosis. </DL>
<A NAME="bacitracin">
<B>bacitracin, </B>noun.<DL COMPACT><DD> an antibiotic obtained from a soil bacillus, effective against various Gram-positive bacteria, used especially in treating skin infections. </DL>
<A NAME="back">
<B>back</B> (1), noun, verb, adjective.<DL COMPACT><DD><I>noun </I> <B>1a. </B>the part of a person's body opposite to his face or to the front part of his body. It extends from the neck to the end of the backbone. <BR> <I>Ex. His sunburned back hurt so much he couldn't turn his head.</I> <DD><B> b. </B>the upper part of any animal's body from the neck to the end of the backbone. <BR> <I>Ex. The little girl rode on the pony's back.</I> <DD><B> 2a. </B>the backbone; spine. <BR> <I>Ex. He fell off the ladder and broke his back.</I> <DD><B> b. </B>the power to act or continue to act. <BR> <I>Ex. The back of opposition resistance was broken last week.</I> <DD><B> 3. </B>the side of anything away from one; the rear, upper, or farther part. <BR> <I>Ex. the back of the head, the back of a hill. Put the chair in the back of the room.</I> <DD><B> 4. </B>the reverse or under side. <BR> <I>Ex. the back of a rug, fabric, or coin.</I> <DD><B> 5. </B>the part of a chair, couch, bench, or the like, which supports the back of a person sitting down. <BR> <I>Ex. When the boy tipped, he broke the back of the chair.</I> <DD><B> 6. </B>that part of a garment which covers the back. <BR> <I>Ex. She split her coat up the back.</I> <DD><B> 7a. </B>a player whose position is behind those players on the line of scrimmage in American football or behind the forwards in soccer, Rugby, and various other games. <DD><B> b. </B>the position of such a player. <DD><B> 8. </B>the spine or backbone of a book. <DD><B> 9. </B>(Archery.) the surface of a bow, opposite the side facing the string. <DD><I>v.t. </I> <B>1. </B>to support or help. <BR> <I>Ex. Many of his friends backed his plan.</I> (SYN) aid, uphold, second. <DD><B> 2. </B>to cause to move away from the front. <BR> <I>Ex. He backed his car out of the driveway.</I> <DD><B> 3. </B>to endorse or underwrite. <BR> <I>Ex. to back a check. The millionaire backed the costs of the new play.</I> (SYN) countersign. <DD><B> 4. </B>to bet on. <BR> <I>Ex. to back a baseball team in the World Series.</I> <DD><B> 5. </B>to make or be a back for. <BR> <I>Ex. Our little farm was backed by woods.</I> <DD><B> 6. </B>to provide with a back; strengthen or support at the back. <BR> <I>Ex. to back satin with heavy crepe, to back a book.</I> <DD><I>v.i. </I> <B>1. </B>to move away from the front. <BR> <I>Ex. She backed away from the dog.</I> <DD><B> 2. </B>to change direction counterclockwise. <BR> <I>Ex. The wind backed from west to southwest.</I> <DD><B> 3. </B>to accumulate and rise. <BR> <I>Ex. The water backed onto the floor from the drain.</I> <DD><I>adj. </I> <B>1. </B>opposite the front; away from one. <BR> <I>Ex. He was sitting in the back seat of the car.</I> (SYN) rear, hinder. <DD><B> 2. </B>belonging to the past. <BR> <I>Ex. Have you read the back issues of this magazine?</I> <DD><B> 3. </B>due but not yet paid; overdue. <BR> <I>Ex. The debtor was overwhelmed with back bills.</I> <DD><B> 4. </B>in distant or frontier regions. <BR> <I>Ex. to live a lonely life in the back country.</I> (SYN) remote, outlying. <DD><B> 5. </B>in a backward direction; coming back; returning. <BR> <I>Ex. a back swing.</I> <DD><B> 6. </B>(Phonetics.) pronounced at the back of the mouth, such as the <I>o</I> in <I>go</I> is. <BR><I>expr. <B>back and fill,</B> <DD><B> a. </B>to trim sails to keep a boat in a channel and floating with the current. The wind alternately fills the sails and spills out of them by a steering maneuver used in combination with handling the sails. </I> <I>Ex. By backing and filling the sails we endeavored to avoid collision with the larger masses [of ice] (James C. Ross).</I> <DD><B> b. </B>(U.S. Informal, Figurative.) to be undecided; keep changing one's mind; vacillate. <BR> <I>Ex. The boar backed and filled as the dogs circled and took nips (Newsweek).</I> <BR><I>expr. <B>back down,</B> </I>to give up an attempt or claim; withdraw. <BR> <I>Ex. He said he could swim, but he backed down when he got to the lake. The Tamils retorted by a threat of civil war and the Government backed down (Observer).</I> <BR><I>expr. <B>back in</B> (or <B>into</B>), </I>to gain (something) chiefly by accident, as through the carelessness of others. <BR> <I>Ex. When all the other heirs died he backed into a fortune.</I> <BR><I>expr. <B>back off,</B> <DD><B> a. </B>to move back a distance. </I> <I>Ex. Hackworth requests that you back off 1,000 meters to the north (Harper's).</I> <DD><B> b. </B>(Figurative.) to withdraw; back down. <BR> <I>Ex. The auto industry executives are not willing to back off their predictions of a big gain (New York Times).</I> <BR><I>expr. <B>back out</B> (or <B>out of</B>), (Informal.) <DD><B> a. </B>to break a promise. </I> <I>Ex. My uncle promised to take me fishing, but he backed out when Mother said she would go too.</I> <DD><B> b. </B>to withdraw from an undertaking. <BR> <I>Ex. The village backed out of building a pool when the cost got too high.</I> <BR><I>expr. <B>back up,</B> <DD><B> a. </B>to move backward. </I> <I>Ex. He backed up against the wall.</I> <DD><B> b. </B>to cause to move backward. <BR> <I>Ex. to back a car up in reverse gear.</I> <DD><B> c. </B>(Figurative.) to help or support. <BR> <I>Ex. The enthusiasts for reform were backed up by the general public.</I> <DD><B> d. </B>to accumulate and rise. <BR> <I>Ex. The extent of backing-up which will be effected is indicated by the excess height of the spillway dam (Science News).</I> <BR><I>expr. <B>behind one's back,</B> </I>without one's knowing it; secretly. <BR> <I>Ex. The cashier of the store stole money behind the owner's back.</I> <BR><I>expr. <B>break the back of,</B> </I>to ruin; destroy. <BR> <I>Ex. A prolonged strike, the President said, "could well break the back of the present expansion" (New York Times).</I> <BR><I>expr. <B>get off one's back,</B> </I>to leave one alone; stop annoying or harassing one. <BR> <I>Ex. The only way to get the military off his back will be ... to make the army less important (Manchester Guardian Weekly).</I> <BR><I>expr. <B>get one's back up,</B> <DD><B> a. </B>to make or become angry. </I> <I>Ex. His nagging got my back up. "I'm your brother." "Are you?" I said, beginning to get my back up (H. Rider Haggard).</I> <DD><B> b. </B>to be stubborn; resist. <BR> <I>Ex. The mule got his back up and refused to move.</I> <BR><I>expr. <B>on</B> (or <B>upon</B>) <B>one's back,</B> <DD><B> a. </B>sick. </I> <I>Ex. ... very feeble, having been for several weeks upon my back (George Catlin).</I> <DD><B> b. </B>helpless; prone; prostrate. <BR> <I>Ex. They never look up to heaven, till God lays them on their back (William Gurnall).</I> <BR><I>expr. <B>put one's back up,</B> <DD><B> a. </B>to make one angry. </I> <I>Ex. He goes his own way ... if you put his back up (Sunday Magazine).</I> <DD><B> b. </B>to be stubborn. <BR> <I>Ex. The baby put her back up and would not eat the cereal in spite of mother's coaxing.</I> <BR><I>expr. <B>stab in the back,</B> </I>to try to injure in a sly, treacherous manner; slander or betray. <BR> <I>Ex. This is the stuff of a good Washington controversy, to be enjoyed in this case even by those stabbed in the back (London Times).</I> <BR><I>expr. <B>the back of beyond,</B> </I>(Informal.) ever so far off; some very out-of-the-way place. <BR> <I>Ex. If anybody's stomach is going to rebel, it is better to get the rebellion over before launching into the back of beyond (Peter Fleming).</I> <BR><I>expr. <B>the back of one's hand,</B> </I>a rebuke or rebuff. <BR> <I>Ex. The backs of our hands are only to those intent upon grinding us down (Patrick Ryan).</I> <BR><I>expr. <B>turn one's back on,</B> </I>to abandon; forsake. <BR> <I>Ex. I have never turned my back on my leader yet (George Macdonald).</I> <BR><I>expr. <B>with</B> (or <B>having</B>) <B>one's back to the wall,</B> </I>unable to escape without fighting; hard-pressed. <BR> <I>Ex. After having their back to the wall for half the game, the players on the home team finally rallied and made a good score.</I> </DL>
<A NAME="back">
<B>back</B> (2), adverb.<DL COMPACT><DD><B> 1. </B>to or toward the rear; backward; behind. <BR> <I>Ex. Please go back three steps.</I> (SYN) rearward. <DD><B> 2. </B>in or toward the past. <BR> <I>Ex. That happened some years back.</I> (SYN) ago. <DD><B> 3. </B>in return. <BR> <I>Ex. They paid back what they borrowed.</I> <DD><B> 4. </B>in the place from which someone or something came. <BR> <I>Ex. Put the books back.</I> <DD><B> 5. </B>in check. <BR> <I>Ex. The police held the crowd back. Hold back your temper.</I> <DD><B> 6. </B>in reserve. <BR> <I>Ex. Keep back enough paint to do the door.</I> <BR><I>expr. <B>back and forth,</B> </I>first one way and then the other. <BR> <I>Ex. Dogs ran back and forth across the field.</I> <BR><I>expr. <B>back</B> (or <B>in back</B>) <B>of,</B> (U.S. Informal.) <DD><B> a. </B>in the rear of; behind. </I> <I>Ex. The barn is in back of the house.</I> <DD><B> b. </B>(Figurative.) supporting; helping. <BR> <I>Ex. Once Jerry was back of you, there was nothing halfway about it (New Yorker).</I> <DD><B> c. </B>causing. <BR> <I>Ex. What's back of his proposal?</I> <BR><I>expr. <B>go back on.</B> </I>See under <B>go</B> (1). </DL>
<A NAME="back">
<B>back</B> (3), noun.<DL COMPACT><DD> a tub, trough, or vat, especially one used by brewers, dyers, or picklers. </DL>
<A NAME="backache">
<B>backache, </B>noun.<DL COMPACT><DD> a continuous pain in the back. </DL>
<A NAME="backalley">
<B>back-alley, </B>adjective.<DL COMPACT><DD> of or having to do with an unpleasant environment or undesirable neighborhood. <BR> <I>Ex. back-alley squalor.</I> </DL>
<A NAME="backandforth">
<B>back-and-forth, </B>adjective.<DL COMPACT><DD> that moves alternately backward and forward; to-and-fro. <BR> <I>Ex. a back-and-forth motion.</I> </DL>
<A NAME="backbar">
<B>backbar, </B>noun.<DL COMPACT><DD> a bar in an open fireplace used to hang a vessel on. </DL>
<A NAME="backbench">
<B>backbench</B> or <B>back-bench, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> a rear seat, especially that of a back-bencher. <BR> <I>Ex. Rumours of revolt on the Government back-benches always make for more excitement (Punch).</I> <DD><I>adj. </I> of, having to do with, or designating a backbencher or backbenchers. <BR> <I>Ex. Backbench opinion can be decisive not only in matters of legislative detail, but also in times of grave crisis--witness the fall of the Chamberlain government in 1940 (Sunday Times).</I> </DL>