to clam up
[phrase form: clam]
01
黙り込む, 突然話さなくなる
to suddenly become silent or refuse to talk, often because of nervousness, fear, or a desire to keep information secret
例
Every time the teacher asked him about his weekend, he would clam up and avoid eye contact.
先生が週末について尋ねるたびに、彼は急に黙り込んで目を合わせようとしなかった。
During the interrogation, the suspect suddenly clam up and refused to answer any more questions.
取り調べ中、容疑者は突然口を閉ざし、これ以上の質問に答えることを拒否した。
