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The Collaborative International Dictionary of English v.0.48 (gcide)

Crack \Crack\ (kr[a^]k), v. t. [imp. & p. p. {Cracked}
(kr[a^]kt); p. pr. & vb. n. {Cracking}.] [OE. cracken,
craken, to crack, break, boast, AS. cracian, cearcian, to
crack; akin to D. kraken, G. krachen; cf. Skr. garj to
rattle, or perh. of imitative origin. Cf. {Crake},
{Cracknel}, {Creak}.]
[1913 Webster]
1. To break or burst, with or without entire separation of
the parts; as, to crack glass; to crack nuts.
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2. To rend with grief or pain; to affect deeply with sorrow;
hence, to disorder; to distract; to craze.
[1913 Webster]

O, madam, my old heart is cracked. --Shak.
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He thought none poets till their brains were
cracked. --Roscommon.
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3. To cause to sound suddenly and sharply; to snap; as, to
crack a whip.
[1913 Webster]

4. To utter smartly and sententiously; as, to crack a joke.
--B. Jonson.
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5. To cry up; to extol; -- followed by up. [Low]
[1913 Webster]

{To crack a bottle}, to open the bottle and drink its
contents.

{To crack a crib}, to commit burglary. [Slang]

{To crack on}, to put on; as, to crack on more sail, or more
steam. [Colloq.]
[1913 Webster]


cracking \cracking\ n.
1. the act of cracking something.

Syn: fracture, crack.
[WordNet 1.5]

2. (Chem.) the process of making lower molecular weight
hydrocarbons from heavier hydrocarbons in petroleum, by
exposure to heat and catalysts. It is used to convert
heavier alkanes into gasoline, or to improve the octane
number of an alkane mixture.
[PJC]


cracking \cracking\ adj.
same as {groovy}, sense 1. [informal]

Syn: bang-up, bully, cool, corking, dandy, great, groovy,
keen, neat, nifty, not bad(predicate), peachy, slap-up,
swell, smashing.
[WordNet 1.5]