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crackbrained
crackdown
cracked
cracked wheat
cracker
cracker-barrel
crackerjack
crackers
crackhead
cracking
crackle
crackling
crackly
cracknel
crackpot
cracksman
Cracow
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crack

crack [ krak ]


verb  (past and past participle cracked, present participle crack·ing, 3rd person present singular cracks)
Definition:
 
1. transitive and intransitive verb break without coming fully apart: to break in such a way that a fine split or splits appear but the split sections do not come apart, or make something break in this way
cracked a rib in falling

2. transitive and intransitive verb break into pieces: to break into pieces, or break something into pieces

3. transitive and intransitive verb break with sharp noise: to break with a sudden sharp noise, or make something break in this way
cracked some eggs into a saucepan

4. transitive and intransitive verb make sharp noise: to make a loud sharp sound, or cause something such as a whip or a rifle to make a loud sharp sound
thunder cracked overhead

5. transitive verb hit something hard: to hit something with a powerful impact
cracked his head on the beam

6. transitive and intransitive verb break open under pressure: to break open because of pressure, or make something such as a nut break or open by pressure

7. transitive and intransitive verb fail or make something fail: to fail, give way, or break down, or make somebody or something do so
The champion was two sets down, but he didn't crack.

8. transitive and intransitive verb break down psychologically: to break down psychologically, or cause somebody to break down psychologically, e.g. under stress or torture

9. intransitive verb become hoarse or change in pitch: to become slightly hoarse or suffer from uncontrollable changes in pitch, especially because of emotion or stress ( refers to voices )

10. transitive verb beat record: to break through something such as an obstacle or barrier, or break a record
Three cyclists cracked the 10-second barrier.

11. transitive verb open something slightly: to open something such as a window slightly

12. transitive verb decode or solve something: to decipher or solve something such as a code, puzzle, or problem
Police are under pressure to crack the case.

13. transitive verb break into something: to force a way into something, especially a safe ( informal )

14. transitive verb open something to use: to open something such as a can or book, in order to get access to its contents ( informal )

15. transitive verb industry break molecules down into smaller molecules: to break down something, especially the heavier hydrocarbons in petroleum, into smaller molecules by using heat or catalysis

16. transitive verb comput disable copy protection: to defeat the copy protection that is intended to prevent somebody from illegally copying and distributing a software product, music CD, or DVD ( slang )

17. transitive verb comput break into computer system: to gain unauthorized access to a computer system with the intention of doing damage or committing a crime ( slang )



noun  (plural cracks)
Definition:
 
1. thin break: a break or flaw in something such as a mirror that is visible as a fine line
cracks in the ice

2. long narrow opening: a relatively long narrow break, hole, or opening in something
peeked through a crack in the fence

3. sharp noise: a sudden loud sharp noise
the crack of a rifle

4. weakness: a flaw, defect, or weak spot

5. uneven voice tone: a hoarseness or uncontrollable change in pitch in somebody's voice

6. purified form of cocaine: a purified and extremely addictive form of cocaine

7. blow: a hard blow from somebody or something ( informal )
a crack over the head

8. sarcastic comment: a sarcastic, funny, or rude remark, especially at somebody else's expense ( informal )

9. attempt: an attempt at something ( informal )



adjective 
Definition:
 
excellent: excellent, expert, or trained to a high degree of efficiency
She's a crack shot.

[ Old English cracian< Germanic, "make a loud noise"]

be not all he's or she's or it's cracked up to be to be not as good as promised or reputed

crack a joke to tell a joke

fall between or through the cracks to be overlooked or forgotten

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