knock/ nɔk /

1.vt.
(strike) 碰撞

2.vt.[inf] 
(criticize) 批评

3.vi.
(on door,window) 敲

4.vi.[engine+] 
发出爆震声

5.vi.[pipes+] 
嘭嘭作响

6.noun [c] 
(blow,bump) 碰撞

7.noun
(on door) 敲门声

to knock a nail into sth
在某处钉钉子
to knock a hole in sth
在某处打个洞
he knocked the drink out of my hand
他碰掉了我手里的饮料
to knock sb to the ground/floor
 [blow,blast,person+] 把某人击倒在地
to knock sb unconscious
 [blow,blast+] 把某人打昏
8.noun [person+] 
打昏某人

to knock some sense into sb
让某人明事理
knock it off!
 [inf] 别胡闹了!
he knocked on {or} at the door
他敲了门
9.vt.,vi.
see knock about

֧ɨ