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Origin and history of clam
clam(n.)
bivalve mollusk, c. 1500 (implied in clam-shell), originally Scottish, apparently a particular use of Middle English clam "pincers, vice, clamp" (late 14c.), from Old English clamm "bond, fetter, grip, grasp," from Proto-Germanic *klam- "to press or squeeze together" (source also of Old High German klamma "cramp, fetter, constriction," German Klamm "a constriction"), which is possibly from a PIE *glem- or *glom- "contain, embrace" (see glebe). If this is right then the original reference is to the shell.
Clam-chowder attested from 1822.
clam(v.)
"to dig for clams," 1630s, American English, from clam (n.). Clam up "be quiet" is 1916, American English, but clam was used in this sense as an interjection mid-14c.
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