Definition of crack noun from the Oxford Advanced Learner's Dictionary

      

    crack

     noun
    noun
    BrE BrE//kræk//
     
    ; NAmE NAmE//kræk//
     
    Addiction
     
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    break
  1. 1  [countable] crack (in something) a line on the surface of something where it has broken but not split into separate parts This cup has a crack in it. Cracks began to appear in the walls. (figurative) The cracks (= faults) in the government's economic policy are already beginning to show.
  2. narrow opening
  3. 2  [countable] a narrow space or opening She peeped through the crack in the curtains. The door opened a crack (= a small amount).
  4. sound
  5. 3[countable] a sudden loud noise a crack of thunder the sharp crack of a rifle shot
  6. hit
  7. 4[countable] crack (on something) a sharp blow that can be heard She fell over and got a nasty crack on the head.
  8. attempt
  9. 5[countable] crack (at something) | crack (at doing something) (informal) an occasion when you try to do something synonym attempt She hopes to have another crack at the world record this year.
  10. drug
  11. 6 (also crack cocaine) [uncountable] a powerful, illegal drug that is a form of cocaine a crack addict See related entries: Addiction
  12. joke
  13. 7[countable] (informal) a joke, especially a critical one He made a very unfair crack about her looks.
  14. conversation
  15. 8(also craic) [uncountable, singular] (Irish English, informal) a good time; friendly, enjoyable talk Where's the crack tonight? He's a person who enjoys a drink and a bit of crack.
  16. Word Origin Old English cracian ‘make an explosive noise’; of Germanic origin; related to Dutch kraken and German krachen. Sense (8) of the noun is from Irish craic ‘entertaining conversation’.Extra examples A fine crack ran up the wall. A loud crack echoed off the empty walls. Could you open the window just a crack? He gave a crack of laughter. He gets really mad if anyone makes a crack about his weight. He had a good crack at opening the door, but it wouldn’t budge. The chandelier hit the floor with a crack. There’s a crack in the fence big enough to look through. We filled the cracks in the plaster before hanging the wallpaper. Wide cracks appeared in the ground during the drought. a tiny crack of light under the door She heard the sharp crack of a rifle shot. She peeped through a crack in the curtains. The cracks in the government’s economic policy are already beginning to show. The door opened a crack. There was a deafening crack of thunder and the heavens opened.Idioms (informal) very early in the morning I have to get up at the crack of dawn.
    a fair crack of the whip
     
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    (British English, informal) a reasonable opportunity to show that you can do something I felt we weren't given a fair crack of the whip.
See the Oxford Advanced American Dictionary entry: crack