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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.

Entries linking to clam

late 14c., "soil of the earth; cultivated land;" also "a piece of land forming part of a clergyman's benefice," from Old French glebe, from Latin gleba, glaeba "clod, lump of earth," possibly from a PIE *glem- or *glom-, which might mean "contain, embrace" or "ball," or might be two different roots. Possible cognates include Old English clamm "a tie, fetter;" Old High German klamma "trap, gorge;" Old Irish glomar "gag, curb;" Latin globus "sphere," gleba, glaeba "clod, lump of earth;" Old English clyppan "to embrace;" Lithuanian glėbys "armful," globti "to embrace, support."

also clam-bake, 1835, "picnic feast consisting chiefly of a mass of clams baked on heated stones," American English, from clam (n.) + bake (n.). By 1937 in jazz slang transferred to "an enjoyable time generally," especially "jam session."

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