clam up



守口如瓶，拒不开口，沉默不语。clam是"蛤蜊"的意思。



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Clam up 用蛤蜊遇到危险时卷身的动作形容人在某些谈话场合的"闭嘴不言语"，使人联想起蛤蜊的行为。例如：

I don't understand why my students are quite talkative during the break but all clam up in class. 我不明白为什么我的学生在课间休息的时候都滔滔不绝，而课堂上倒沉默不语。

此外，clam up还表示在谈话间的"突然停止"。比如：

Charlie's father heard Charlie talking to his friend on telephone in other room, but when he opened the door, Charlie clamed up.

查理的父亲听见查理在另一个房间给朋友打电话，可是当他打开房门，查理突然不吭声了。



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