1. A long narrow opening (synset 109281621)
  2. A narrow opening (synset 103421239)
    "he opened the window a crack"
  3. A long narrow depression in a surface (synset 113930286)
  4. A sudden sharp noise (synset 107396023)
    "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig"
  5. A chance to do something (synset 114509257)
    "he wanted a shot at the champion"
  6. Witty remark (synset 106780568)
  7. A blemish resulting from a break without complete separation of the parts (synset 104700444)
    "there was a crack in the mirror"
  8. A purified and potent form of cocaine that is smoked rather than snorted;
    Highly addictive (synset 103129835)
  9. A usually brief attempt (synset 100788715)
    "he took a crack at it"; "I gave it a whirl"
  10. The act of cracking something (synset 100377802)
  1. Of the highest quality (synset 302349970)
    "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"
  1. Become fractured;
    Break or crack on the surface only (synset 200337070)
    "The glass cracked when it was heated"
  2. Make a very sharp explosive sound (synset 202187470)
    "His gun cracked"
  3. Make a sharp sound (synset 202187297)
    "his fingers snapped"
  4. Hit forcefully;
    Deal a hard blow, making a cracking noise (synset 201404609)
    "The teacher cracked him across the face with a ruler"
  5. Pass through (a barrier) (synset 200540850)
    "Registrations cracked through the 30,000 mark in the county"
  6. Break partially but keep its integrity (synset 200338044)
    "The glass cracked"
  7. Break suddenly and abruptly, as under tension (synset 200337875)
    "The pipe snapped"
  8. Gain unauthorized access computers with malicious intentions (synset 202576982)
    "she cracked my password"; "crack a safe"
  9. Suffer a nervous breakdown (synset 201789398)
  10. Tell spontaneously (synset 200955955)
    "crack a joke"
  11. Cause to become cracked (synset 200337528)
    "heat and light cracked the back of the leather chair"
  12. Reduce (petroleum) to a simpler compound by cracking (synset 200239428)
  13. Break into simpler molecules by means of heat (synset 200239258)
    "The petroleum cracked"

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