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clench (v.)

"to grasp firmly," c. 1300, from Old English (be)clencan "to hold fast, make cling," causative of clingan (see cling, and compare clinch); compare stench/stink. Meaning "to set firmly together" (of fists, teeth, etc.) is from 1747 (clinch in this sense is attested from 1630s). Figurative sense of "fix or secure by a final act" is from 1670s.  Related: Clenched; clenching.

clench (n.)

1590s, "the part of a nail that clinches," from clench (v.). Also "mode of securing a nail by hammering it back once driven." Meaning "a grasp, grip" is from 1779. Compare clinch.

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