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Definition of 'crack'


  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


  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"


  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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