clam up
verb
(intr, adverb) informal to keep or become silent or withhold information
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You may have read the word "simmer" in a recipe or two, but what does it really mean?
Words nearby clam up
clamp down on, clamper, clamp forceps, clamshell, clamshell door, clam up, clamworm, clan, Clancy, clandestine, clang
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Idioms and Phrases with clam up
clam up
Refuse to talk or respond, as in Whenever she asks her teenager about his activities, he clams up. This term alludes to the tightly closed valves of a live clam. [Slang; early 1900s]
The American Heritage® Idioms Dictionary
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