Synonym: bang, blow, break, noise, open, shot, slit, split. Similar words: rack, meritocracy, track, track down, craft, crawl, crash, scratch. Meaning: [kræk] 
n. 1. a long narrow opening 2. a narrow opening 3. a long narrow depression in a surface 4. a sudden sharp noise 5. a chance to do something 6. witty remark 7. a blemish resulting from a break without complete separation of the parts 8. a purified and potent form of cocaine that is smoked rather than snorted 9. a usually brief attempt 10. the act of cracking something. v. 1. become fractured; break or crack on the surface only 2. make a very sharp explosive sound 3. make a sharp sound 4. hit forcefully; deal a hard blow, making a cracking noise 5. pass through (a barrier) 6. break partially but keep its integrity 7. break suddenly and abruptly, as under tension 8. suffer a nervous breakdown 9. tell spontaneously 10. cause to become cracked 11. reduce (petroleum) to a simpler compound by cracking 12. break into simpler molecules by means of heat. adj. of the highest quality.
n. 1. a long narrow opening 2. a narrow opening 3. a long narrow depression in a surface 4. a sudden sharp noise 5. a chance to do something 6. witty remark 7. a blemish resulting from a break without complete separation of the parts 8. a purified and potent form of cocaine that is smoked rather than snorted 9. a usually brief attempt 10. the act of cracking something. v. 1. become fractured; break or crack on the surface only 2. make a very sharp explosive sound 3. make a sharp sound 4. hit forcefully; deal a hard blow, making a cracking noise 5. pass through (a barrier) 6. break partially but keep its integrity 7. break suddenly and abruptly, as under tension 8. suffer a nervous breakdown 9. tell spontaneously 10. cause to become cracked 11. reduce (petroleum) to a simpler compound by cracking 12. break into simpler molecules by means of heat. adj. of the highest quality. 
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(61) Slowly he worked the screwdriver into the crack.
(62) Could you open the window just a crack?
(63) He squeezed into a crack between two rocks.
(64) The police decided to crack down on drug addicts.
(65) In severe cases, the skin can crack and weep.
(66) This panel has a crack on it.
(67) He's a crack shot .
(68) The oil tank had developed a small crack.
(69) He gave a crack of laughter.
(70) The door opened a crack .
(71) He's a hard nut to crack.
(72) The wind whistled through a crack in the door.
(73) There's a sinister - looking crack in the roof.
(74) His voice is beginning to crack.
(75) Close examination revealed a crack in the vase.
(76) We'll have to leave at the crack of dawn.
(77) He wedged himself through the narrow crack.
(78) It was her first crack at beating the record.
(79) Crack the eggs into a bowl.
(80) I shone my torch through the crack.
(81) His bag wedged in the crack of the door.
(82) She made a crack about his fatness.
(83) There was an ear-splitting crack.
(84) Crack is a much cheaper,(http://sentencedict.com/crack.html) smokable form of cocaine which is powerfully addictive.
(85) I need to crack on with my project work this weekend.
(86) The council has announced its intention to crack down on parking offences.
(87) The crack troops were held in reserve behind the front line.
(88) Their mission was to crack into the computer system of a major corporation.
(89) It strikes me that he's right a tough nut to crack.
(90) It's only right that all the candidates should be given a fair crack of the whip.