It'started off well, but he seemed to clam up towards the end.

刚开始进行得很好，但是最后他似乎有些沉默。

辞典例句

The secret for successful marriage is to clam up during a disagreement.

成功婚姻的秘诀,就是当双方意见不合时,闭上嘴巴.

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They are afraid he's going to clam up on them.

他们担心他将对他们守口如瓶.

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I do not mean to pry, so there's no need to clam up on me.

我并不想要探听什么, 因此你不必对我守口如瓶.

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