Clam up
Meaning: to suddenly stop talking, usually because you are embarrassed or nervous
Example: The witness was ready to testify at the trial, but at the last minute she clammed up and wouldn’t say a thing. The boy’s parents were sure he knew something about the theft at school, but when they asked him about it, he clammed up.
Выучи грамотный разговорный английский до уверенного владения всего за 9 месяцев по системе естественного усвоения иностранных языков. Жми!
Example: The witness was ready to testify at the trial, but at the last minute she clammed up and wouldn’t say a thing. The boy’s parents were sure he knew something about the theft at school, but when they asked him about it, he clammed up.