Meaning of the word "clam up" in English

What does "clam up" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

clam up

US /klæm ʌp/
UK /klæm ʌp/
"clam up" picture

Phrasal Verb

1.

to suddenly stop talking, especially when you are expected to speak

Example:
When the police started asking questions, he just clammed up.
She tends to clam up when she's nervous.
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