crack/ kræk /

1.noun [c] 
(in bone,dish,glass,wall) 裂缝

2.noun [s] 
(gap) 缝隙

3.noun [c] 
(noise) 噼啪声

4.noun [+of whip] 
噼啪声

5.noun [c] [inf] 
(joke) 挖苦话

6.noun [inf] 
to have a crack (at sth) (attempt) 尝试(某事)

7.noun [u] 
(drug) 纯可卡因

8.vt.[+dish] [ glass] [ mirror] 
(break) 使开裂

9.vt.[+bone] 
使骨折

10.vt.[+nut] [ egg] 
打破

11.vt.[+whip] [ twig] 
(noisily) 使噼啪作响

12.vt.[+problem] [ code] 
(solve) 解决

13.vi.[dish] [ mirror] [ pipe+] 
开裂

14.vi.[inf] [person+] 
(lose control) 垮掉

15.adjective [+soldier] [ athlete] 
技艺高超的

to crack one's head/knee on sth
头/膝盖在某物上撞了一下
to crack an egg into a bowl
打一个鸡蛋在碗里
to crack a joke
讲笑话
to get cracking
 [BRIT] [inf] 开始大干起来