<B>crack, </B>noun, verb, adjective, adverb.<DL COMPACT><DD><I>noun </I> <B>1a. </B>a split or opening made by breaking without separating into parts. <BR> <I>Ex. There is a crack in this cup.</I> <DD><B> b. </B>(Figurative.) a flaw or defect; weakness. <BR> <I>Ex. There were no cracks in her character. We tried to paper over the cracks in the script's dialogue.</I> <DD><B> 2. </B>a narrow opening. <BR> <I>Ex. I can see between the cracks in the floorboards.</I> (SYN) cleft, fissure, crevice, chink. <DD><B> 3. </B>a sudden, sharp noise. <BR> <I>Ex. the crack of a whip or a rifle, a crack of thunder.</I> (SYN) clap, report. <DD><B> 4. </B>(Informal, Figurative.) a hard, sharp blow. <BR> <I>Ex. The falling branch gave me a crack on the head.</I> <DD><B> 5. </B>(Informal.) an instant; moment. <BR> <I>Ex. We got up at thecrack of dawn. I'll be with you in a crack.</I> <DD><B> 6. </B>(Informal.) a try; effort; attempt. <BR> <I>Ex. to take a crack at dancing. I took a crack at the job and succeeded.</I> <DD><B> 7. </B>(Slang, Figurative.) a funny or clever remark; joke. <DD><B> 8. </B>(Informal, Figurative.) a cutting remark; gibe. <BR> <I>Ex. If he makes another crack about my singing, he'll be sorry.</I> <DD><B> 9. </B>unsoundness of mind. <DD><B> 10. </B>(Informal.) a superior person or thing. <BR> <I>Ex. She is a crack at skiing.</I> <DD><B> 11. </B>a cracking of the voice. <DD><B> 12. </B>(Slang.) <DD><B> a. </B>a burglary. <DD><B> b. </B>a burglar. <DD><B> 13. </B>(U.S.) an extremely potent, free-based form of cocaine with a short-term effect. <BR> <I>Ex. Crack, a highly addictive form of cocaine, is available from most of the 50 drug dealers doing business in Washington Square Park and on Greenwich Village streets 24 hours a day (New York Times).</I> <DD><B> 14. </B>(Archaic.) a boast. <DD><B> 15. </B>(Scottish.) a chat; gossip. <DD><I>v.i. </I> <B>1. </B>to break without separating into parts. <BR> <I>Ex. The glass cracked when I poured boiling water into it.</I> <DD><B> 2. </B>to make a sudden, sharp noise; snap. <BR> <I>Ex. The whip cracked.</I> <DD><B> 3. </B>to break with a sudden, sharp noise. <BR> <I>Ex. The tree cracked and fell when lightning struck it.</I> <DD><B> 4. </B>to become harsh, broken, or shrill. <BR> <I>Ex. His voice cracked with emotion.</I> <DD><B> 5. </B>(Informal.) to give way; break down. <BR> <I>Ex. His mind cracked under the strain of working for three days without sleep.</I> (SYN) fail, collapse. <DD><B> 6. </B>(Dialect.) to boast; brag. <DD><B> 7. </B>(Scottish.) to chat; gossip. <DD><I>v.t. </I> <B>1. </B>to break without separating into parts. <BR> <I>Ex. You have cracked the window.</I> (SYN) split, fracture. <DD><B> 2. </B>to cause to make a sudden, sharp noise. <BR> <I>Ex. The stagecoach driver cracked the whip.</I> (SYN) snap. <DD><B> 3. </B>to break with a sudden, sharp noise. <BR> <I>Ex. We cracked the nuts.</I> <DD><B> 4. </B>to hit with a hard, sharp blow. <BR> <I>Ex. The falling branch cracked me on the head. The boxer cracked his opponent on the jaw.</I> (SYN) smack. <DD><B> 5. </B>to make (the voice) harsh or shrill. <DD><B> 6. </B>(Figurative.) to break into. <BR> <I>Ex. The burglar cracked the safe.</I> <DD><B> 7. </B>(Informal, Figurative.) to break through. <BR> <I>Ex. to crack the sound barrier.</I> <DD><B> 8. </B>(Informal.) to tell or say (something funny or clever). <BR> <I>Ex. She cracked a joke.</I> <DD><B> 9. </B>(Figurative.) to figure out the meaning of (a code); decipher. <BR> <I>Ex. In wartime, each enemy tries to crack the other's code. She once cracked a Chinese code without knowing Chinese (George S. Kaufman).</I> <DD><B> 10. </B>to separate (as petroleum or coal tar) into various substances. <BR> <I>Ex. The refinery cracks petroleum to make gasoline.</I> <DD><B> 11. </B>to ruin; damage. <BR> <I>Ex. to crack someone's reputation or credit.</I> <DD><B> 12. </B>to break with pain or grief. <BR> <I>Ex. The death of his dog cracked the boy's heart.</I> <DD><B> 13. </B>(U.S. Informal, Figurative.) to open and use. <BR> <I>Ex. He did not crack a book until the final examination.</I> <DD><B> 14. </B>(Obsolete.) a boast. <BR> <I>Ex. Which he ... crackes to be a most soveraigne remedie (Robert Burton).</I> <DD><I>adj. </I> (Informal.) very good; excellent; first-rate. <BR> <I>Ex. a crack train. Buffalo Bill was a crack shot.</I> <DD><I>adv. </I> with a crack; with a cracking sound. <BR><I>expr. <B>crack down,</B> </I>(Informal.) to take stern measures. <BR> <I>Ex. The police cracked down and hauled away cars that were double-parked.</I> <BR><I>expr. <B>cracked up,</B> </I>(Informal.) praised or claimed. <BR> <I>Ex. This book is not what it is cracked up to be.</I> <BR><I>expr. <B>crack on,</B> </I>(British Informal.) to go on; carry on. <BR> <I>Ex. Big John with his immense experience had things under his personal control ("Crack on, lads!" was a favorite Big John order) (Sunday Times).</I> <BR><I>expr. <B>crack up,</B> <DD><B> a. </B>to crash or smash. </I> <I>Ex. When the driver skidded off the road he cracked up his car against a tree. The airplane cracked up as it landed.</I> <DD><B> b. </B>to suffer a mental or physical collapse. <BR> <I>Ex. She was in danger of cracking up under the strain of overworking.</I> <DD><B> c. </B>(U.S. Slang.) to laugh or cause to laugh uncontrollably; convulse with laughter. <BR> <I>Ex. And then Fred shouts: "I am the great pumpkin!" The whole room cracks up (Harper's).</I> adj. <B>crackable.</B> </DL>
<B>crack baby,</B><DL COMPACT><DD> a baby born with various disabilities or deformities caused by the mother's use of crack-cocaine while pregnant. <BR> <I>Ex. The most widely cited estimate--[of] fetally exposed babies (or "crack babies") born per year--is much too high (Washington Post).</I> </DL>
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<B>crackbrain, </B>noun.<DL COMPACT><DD> a crazy or insane person. </DL>
<A NAME="crackbrained">
<B>crackbrained, </B>adjective.<DL COMPACT><DD> crazy; insane. <BR> <I>Ex. I cannot summarize here nine hundred pages of allegations that are usually crackbrained when they are not dishonest (Harper's).</I> </DL>
<A NAME="crackdown">
<B>crackdown, </B>noun.<DL COMPACT><DD> (Informal.) the act of taking, or bringing to bear, stern measures or swift disciplinary action. </DL>
<A NAME="cracked">
<B>cracked, </B>adjective.<DL COMPACT><DD><B> 1. </B>broken without separating into parts; broken coarsely. <BR> <I>Ex. cracked ice, cracked wheat, a cracked cup.</I> (SYN) fractured. <DD><B> 2. </B>having harsh notes; lacking evenness; broken. <BR> <I>Ex. The crying boy spoke in a cracked voice.</I> (SYN) raucous. <DD><B> 3. </B>(Informal.) crazy; insane. (SYN) deranged. </DL>
<A NAME="cracker">
<B>cracker, </B>noun.<DL COMPACT><DD><B> 1. </B>a thin, crisp biscuit or wafer. <BR> <I>Ex. a soda cracker.</I> <DD><B> 2. </B>a person or instrument that cracks. <DD><B> 3. </B>a firecracker. <BR> <I>Ex. This rowdy element later entered the grounds of Union Buildings ... climbed to the top of the adjoining General Botha statue and threw crackers (London Times).</I> <DD><B> 4. </B>a small paper roll which explodes when it is pulled at both ends; cosaque. It is used as a party favor and sometimes contains a motto, candy, or other surprise. <DD><B> 5. </B>something put at the end of a whiplash to make a cracking sound. <DD><B> 6. </B>(U.S. Dialect.) a poor white person living in the hills or backwoods of Georgia, Florida, or other Southern state (often used in an unfriendly way). <DD><B> 7. </B>the apparatus used for cracking petroleum, in a refinery. <DD><B> 8. </B>(Obsolete.) <DD><B> a. </B>a boaster; braggart. <DD><B> b. </B>a liar. </DL>
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<B>cracker barrel,</B><DL COMPACT><DD> an open barrel of salted crackers, formerly often found in American country stores. </DL>
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<B>cracker-barrel, </B>adjective.<DL COMPACT><DD> having the plainness, robust humor, and informality of country people; unsophisticated; down-to-earth. <BR> <I>Ex. He has the cracker-barrel wit of a Will Rogers.</I> </DL>
<A NAME="crackerbeak">
<B>cracker beak,</B><DL COMPACT><DD> a type of strong beak such as that of sparrows, grosbeaks, and other finches, used for cracking the hard shells of seeds which they eat. </DL>
<A NAME="crackerjack">
<B>crackerjack, </B>noun, adjective.<DL COMPACT><DD> (Slang.) <DD><I>noun </I> <B>1. </B>a person or thing of superior ability or grade. <BR> <I>Ex. He is a crackerjack at dominoes.</I> <DD><B> 2. </B>a kind of candied popcorn. <DD><I>adj. </I> of superior ability or grade. <BR> <I>Ex. a crackerjack motorboat. He had his bartenders--five crackerjack men--try to find out what you could put with ginger beer to make it more attractive (New Yorker).</I> </DL>
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<B>crackers, </B>adjective.<DL COMPACT><DD> (British Slang.) crazy; mad. <BR> <I>Ex. Leatherjacket got it eventually we know that ... and then went crackers (Maurice Proctor).</I> </DL>
<A NAME="crackhead">
<B>crackhead, </B>noun.<DL COMPACT><DD> (U.S. Slang.) a person addicted to crack (free-based cocaine). </DL>
<A NAME="cracking">
<B>cracking, </B>noun, adjective, adverb.<DL COMPACT><DD><I>noun </I> the process of changing certain hydrocarbons in petroleum and other oils into lighter hydrocarbons by heat and pressure and a catalyst. Cracking is used in producing ordinary gasoline. <DD><I>adj. </I> (Informal.) <B>1. </B>vigorous; brisk. <BR> <I>Ex. a cracking pace.</I> <DD><B> 2. </B>thorough; complete. <BR> <I>Ex. a cracking bore.</I> <DD><I>adv. </I> (Informal.) thoroughly. <BR> <I>Ex. a cracking good race.</I> <BR><I>expr. <B>get cracking,</B> </I>(Informal.) to make a vigorous start; get going. <BR> <I>Ex. The five-minute rest period was up; time to stop speculating and get cracking (Atlantic).</I> </DL>