Meaning of clam up | Babel Free

Definitions

1. To become silent; to stop talking.
   informal, intransitive
2. To make or become clammy.
   ambitransitive

Equivalents

Examples

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

“Teenagers' father. Alright, Matt, I think you've made your point. Matt Foley: Dad, I sincerely wish you'd do everyone a great service, and clam up!”

CEFR level