clamp down on(v.+adv.+prep.)
压制; 取缔 control, especially to limit sth bad; deal firmly with sth/sb bad
▲clamp down on sb/sth
When the President's position was threatened, he issued an order to clamp down on all anti-government activities.当总统的地位受到威胁时,他下令取消一切反政府活动。

用作及物动词
▲S+～+n./pron.
The policeman clamped handcuffs around his wrists.警察给他戴上手铐。
Clamp the two pieces of wood together until the glue dries.用夹钳把两块木板夹紧,等胶水干了再松开。

He used a clamp to hold the arm on the chair until the glue dried.他用夹子将扶手夹在椅子上,直到胶水干后再取下。

［同义词］ v. fasten, fix n. brace, grip
［词源］＜古荷兰语klampe(夹子)