n.名詞挫折I got quite a knock when they told me I wasn’t working so hard
v.t.及物動詞挑剔Look, don’t knock Dave, he’s doing his best to help everyone
v.t.及物動詞敲擊;敲打I will knock on your door at exactly 7:00 p.m.
v.t.及物動詞撞;敲Today we will knock down the oldest building in the campus
n.名詞敲打A knock was heard on the door downstairs