clamming up

listen to the pronunciation of clamming up
English - English
Present participle of clam up
clam up
To become silent; to stop talking, to shut up

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

clam up
refuse to talk or stop talking; fall silent; "The children shut up when their father approached"
clam up
If someone clams up, they stop talking, often because they are shy or to avoid giving away secrets. As soon as I told her my name, she clammed up
clamming up
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