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clamp (n.)

device for fastening or holding, c. 1300, probably from Middle Dutch clampe (Dutch klamp), from Proto-Germanic *klam-b- "clamp, cleat;" cognate with Middle Low German klampe "clasp, hook," Old High German klampfer "clip, clamp;" also probably related to Middle Dutch klamme "a clamp, hook, grapple," Danish klamme "a clamp, cramp," Old English clamm "a tie, fetter," perhaps from the same root as Latin glomus "ball-shaped mass" (see glebe).

It took the place of earlier clam "clamp, brace," from Old English clamm "bond, fetter, grip, grasp" (see clam (n.)).

clamp (v.)

"to fasten with a clamp," 1670s, from clamp (n.). Related: Clamped; clamping.

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Definitions of clamp from WordNet
1
clamp (v.)
fasten or fix with a clamp;
clamp the chair together until the glue has hardened
clamp (v.)
impose or inflict forcefully;
The military government clamped a curfew onto the capital
2
clamp (n.)
a device (generally used by carpenters) that holds things firmly together;
Synonyms: clinch
From wordnet.princeton.edu