英语的短语问题啦

knock into
偶然撞上
knock down
1. 击倒;击落
2. 拆毁
3. 降低
knock off
1. 撞倒;打掉
2. 减去
3. 停止;歇工

knock into 撞上
konck down 击倒, 拆卸, 拍卖出
konck off 敲掉, 击倒, <口>(从价格、帐单等中)减去，除去

knock into
打进; 撞进
Can you knock this nail into the wood?
你能把这钉子钉进木头里吗?
偶然碰到(某人)
I knocked into my old teacher in the town this morning.
我今天上午在镇上碰到了过去教过我的老师。
〈非正〉把…灌输给
Can't you knock some sense into that stupid boy's head?
难道你不能下下工夫让那个笨孩子开窍?
〈口〉彻底击败
At the last election, the Government won easily, knocking the Opposition into a cocked hat.
在上次选举中, 政府挫败了反对党, 轻而易举地取得了胜利。

knock down
〈非正〉击倒, 撞倒
He knocked his opponent down with one blow in the competition.
比赛中他一拳就打倒了他的对手。
拆卸
The portable device easily knocks down.
这种轻便装置容易拆卸。
〈非正〉降价; 减少
The man was asking ￡5 for the dress, but I knocked it down to ￡4.