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clamp

/klæmp/

Device or action for gripping tightly

From O.English clam (bond) + Middle Dutch / Proto-Germanic klamp (clamp).

noun
verb
clam
Old English
Verified
clamm
bond, fetter, grip, grasp

from Old English clamm "bond, fetter, grip, grasp" (see clam (n.)).

Middle English
Verified
clam
pincers, vice, clamp

from Middle Dutch clampe (Dutch klamp )

+1 more source
klamp
Proto-Germanic
Verified
*klampō
reconstructed
clamp, clasp, cramp

from Proto-Germanic *klampō (“clamp, clasp, cramp”), related to Proto-West Germanic *klammjan. Cognate with Middle Low...

Middle Dutch
Verified
clamp, klampe
a clamp, hook

from Middle Dutch clamp, klampe (“a clamp, hook”)

Combined
clamp
Entered English around c. 1300, probably from Middle Dutch; it also seems to have crowded out the older English clam in similar senses.
Modern English
Verified
clamp
generalized to tools, surgical devices, car wheel clamps, and the verb 'to hold tightly'

from Middle Dutch clampe (Dutch klamp )

+1 more source
Modern English
clamp

A clamp is basically a handshake with a vice-grip. English seems to have picked it up around 1300 from Middle Dutch, where clamp and klampe were the sort of hard, practical words you’d expect around docks, workshops, and stonecutters’ yards. But the family goes deeper: Old English already had clamm, meaning a bond or fetter, so the idea of something pinning, gripping, or binding was already wandering around the language waiting for a better tool. That same grim little Germanic cluster turns up in words for cramp, clasp, and even harpoon-adjacent tools like the Old French harpon, where the whole point is to snag and hold. So when you clamp two boards together, you’re using a word that has been obsessed for a thousand years with one thing: no escape.

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