- crack
- noun1》 a narrow opening between two parts of something which has split or been broken.2》 a sudden sharp or explosive noise.↘a sharp blow.3》 informal a joke or jibe.4》 (also craic) chiefly Irish enjoyable entertainment; a good time.↘Scottish & N. English a conversation.5》 informal an attempt to do something.6》 (also crack cocaine) a potent hard crystalline form of cocaine broken into small pieces.verb1》 break or cause to break with little or no separation of the parts.2》 give way under pressure or strain.↘(crack up) informal suffer an emotional breakdown under pressure.↘(crack up) informal burst into laughter.3》 make or cause to make a sudden sharp or explosive sound.↘hit hard.4》 (of a person's voice) suddenly change in pitch, especially through strain.5》 (crack down on) informal take severe measures against.6》 informal solve, interpret, or decipher.↘break into (a safe).7》 (crack on) Brit. informal proceed or progress quickly.8》 tell (a joke).9》 decompose (hydrocarbons) by heat and pressure to produce lighter hydrocarbons.adjective very good or skilful: a crack shot.Phrasesbe cracked up to be [with negative] informal be asserted to be: acting is not as glamorous as it's cracked up to be.crack a crib archaic, informal break into a house.crack of dawn daybreak.crack of doom a thunder peal announcing the Day of Judgement.crack of the whip Brit. informal a chance to try or participate in something.get cracking informal act quickly and energetically.Derivativescracky adjectiveOriginOE cracian 'make an explosive noise'; of Gmc origin.
English new terms dictionary. 2014.