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| a fool or simpleton; ninny. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| clam up | |
| —vb | |
| informal (intr, adverb) to keep or become silent or withhold information | |
clam definition
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clam up definition
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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]