/klæm/

to become silent suddenly, usually because you are embarrassed or nervous, or do not want to talk about a particular subject

(通常指因?yàn)閷擂巍⒕o張或不愿談?wù)撃骋辉?huà)題而突然)沉默不語(yǔ)，閉口不言，拒不開(kāi)口

He just clams up if you ask him about his childhood.

要是你問(wèn)起他的童年，他就干脆不吭聲了。

He's hiding something. He clams up every time we try to ask him about Mary.

他在竭力隱瞞什么東西。每次問(wèn)他瑪麗的事他都支支吾吾。