1. [Noun]: the act of cracking something

2. [Noun]: a purified and potent form of cocaine that is smoked rather than snorted

3. [Noun]: a blemish resulting from a break without complete separation of the parts; "there was a crack in the mirror"

4. [Noun]: a sudden sharp noise; "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig"

5. [Noun]: a long narrow depression in a surface

6. [Noun]: a usually brief attempt; "he took a crack at it"; "I gave it a whirl"

7. [Noun]: a narrow opening; "he opened the window a crack"

8. [Noun]: witty remark

9. [Noun]: a long narrow opening

10. [Noun]: a chance to do something; "he wanted a shot at the champion"

11. 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"

12. [Verb]: tell spontaneously; "crack a joke"

13. [Verb]: suffer a nervous breakdown

14. [Verb]: make a very sharp explosive sound; "His gun cracked"

15. [Verb]: break into simpler molecules by means of heat; "The petroleum cracked"

16. [Verb]: become fractured; break or crack on the surface only; "The glass cracked when it was heated"

17. [Verb]: break suddenly and abruptly, as under tension; "The rope snapped"

18. [Verb]: pass through (a barrier); "Registrations cracked through the 30,000 mark in the county"

19. [Verb]: hit forcefully; deal a hard blow, making a cracking noise; "The teacher cracked him across the face with a ruler"

20. [Verb]: make a sharp sound; "his fingers snapped"

21. [Verb]: reduce (petroleum) to a simpler compound by cracking

22. [Verb]: cause to become cracked; "heat and light cracked the back of the leather chair"

23. [Verb]: break partially but keep its integrity; "The glass cracked"

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