to clam up
[phrase form: clam]
01
突然沉默, 拒绝说话
to suddenly become silent or refuse to talk, often because of nervousness, fear, or a desire to keep information secret
例子
During the interrogation, the suspect suddenly clam up and refused to answer any more questions.
在审讯过程中，嫌疑人突然闭口不言，拒绝回答任何更多的问题。
