Definition of 'crack'

Noun

1. a long narrow opening
      Synonyms: cleft crevice fissure scissure
2. a narrow opening; "he opened the window a crack"
      Synonyms: gap
3. a long narrow depression in a surface
      Synonyms: crevice cranny fissure chap
4. a sudden sharp noise; "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig"
      Synonyms: cracking snap
5. a chance to do something; "he wanted a shot at the champion"
      Synonyms: shot
6. witty remark
      Synonyms: wisecrack sally quip
7. a blemish resulting from a break without complete separation of the parts; "there was a crack in the mirror"
8. a purified and potent form of cocaine that is smoked rather than snorted
      Synonyms: tornado
9. a usually brief attempt; "he took a crack at it"; "I gave it a whirl"
      Synonyms: fling go pass whirl offer
10. the act of cracking something
       Synonyms: fracture cracking

Verb

1. become fractured; break or crack on the surface only; "The glass cracked when it was heated"
      Synonyms: check break
2. make a very sharp explosive sound; "His gun cracked"
3. make a sharp sound; "his fingers snapped"
      Synonyms: snap
4. hit forcefully; deal a hard blow, making a cracking noise; "The teacher cracked him across the face with a ruler"
5. pass through (a barrier); "Registrations cracked through the 30,000 mark in the county"
      Synonyms: break through
6. break partially but keep its integrity; "The glass cracked"
7. break suddenly and abruptly, as under tension; "The rope snapped"
      Synonyms: snap
8. suffer a nervous breakdown
      Synonyms: crack up crock up break up collapse
9. tell spontaneously; "crack a joke"
10. cause to become cracked; "heat and light cracked the back of the leather chair"
11. reduce (petroleum) to a simpler compound by cracking
12. break into simpler molecules by means of heat; "The petroleum cracked"

Adjective

1. of the highest quality; "an ace reporter"; "a crack shot"; "a first-rate golfer"; "a super party"; "played top-notch tennis"; "an athlete in tiptop condition"; "she is absolutely tops"
      Synonyms: ace A-one fantastic first-rate super tiptop topnotch tops

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