clam up

[klam] Origin

clam

1[klam] noun, verb, clammed, clam·ming.
noun
1.
any of various bivalve mollusks, especially certain edible species. Compare quahog, soft-shell clam.
2.
Informal. a secretive or silent person.
4.
Slang. a dollar or the sum of a dollar: I only made 60 clams a week.
verb (used without object)
5.
to gather or dig clams.

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Clam up is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
6.
clam up, Slang. to refuse to talk or reply; refrain from talking or divulging information: The teacher asked who had thrown the eraser, but the class clammed up.

Origin:
1585–95; short for clam-shell, i.e., bivalve with a shell that clamps. See clam2, shell

clam·like, adjective
clam·mer, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
clam up
 
vb
informal (intr, adverb) to keep or become silent or withhold information

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

clam
c.1500, "bivalve mollusk," originally Scottish, from M.E. clam "pincers, vice, clamp," from O.E. clamm "bond, fetter," from P.Gmc. *klam-. Clambake is from 1835. Clam up is 1916, Amer.Eng., but clam was used in this sense as an interjection c.1350.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

clam definition


  1. n.
    a dollar. (Underworld.) : You got a couple of clams I can bum for a little bottle?
  2. n.
    a tight-lipped person. : Suddenly, she became a clam and wouldn't talk anymore.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
Cite This Source

clam up definition


  1. in.
    to get quiet. (See also dummy up.) : The minute they got him inside the cop-shop, he clammed up.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
Cite This Source
American Heritage
Idioms & Phrases

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® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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