Definitions for clam up
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Princeton's WordNet
close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum(verb)
refuse to talk or stop talking; fall silent
"The children shut up when their father approached"
Wiktionary
clam up(Verb)
To become silent; to stop talking, to shut up.
Origin: By analogy with a clam closing itself.
Citation
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"clam up." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/clam up>.