English Dictionary

clam up

verb

(intransitive, slang) To become silent; to stop talking, to shut up. / (transitive, intransitive) To make or become clammy.

She tends to clam up when she's nervous.

意味（1）

(intransitive, slang) To become silent; to stop talking, to shut up.

Maybe he … or she … was a witness who refused to clam up … a whistle blower …

意味（2）

(transitive, intransitive) To make or become clammy.