1. He clammed up when the teacher asked him about the incident.
老师问起那件事时，他突然不说话了。

2. She tends to clam up in stressful situations.
她在压力大的情况下往往会变得沉默。

3. Don't clam up—tell me what happened.
别沉默不语，告诉我发生了什么。

4. The witness clammed up during the interview.
证人在采访中突然保持沉默。

A: Why did you clam up during the meeting?
A：你为什么在会议中突然不说话？

B: I was not sure how to explain the situation.
B：我不确定该怎么解释那个情况。

1) 因紧张或害怕而沉默

2) 不愿透露信息而闭口不言

3) 在压力下停止交流

1. 指突然不再说话或变得沉默。

e.g. He clammed up when questioned by the police.
他在被询问时突然沉默不语。

2. 表示因紧张或不安而停止表达。

e.g. She clammed up during the interview.
她在面试中变得沉默。

phrasal verb

1. to suddenly stop talking, especially because you are nervous or unwilling to share information

Synonym: shut up, go silent