: to press (the strings of a stringed instrument) against the frets
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Fret and Eating
The meat-and-potatoes meaning of fret is "to eat." The verb is used literally, as in "Mothsfretted the clothing," but more often figuratively to describe actions that corrode or wear away. A river "frets away" at its banks, or something might be said to be "fretted out" with time or age. Fret also applies to emotional experiences so that something that "eats away at someone" is "fretting the heart or mind."
Middle English, to devour, fret, from Old English fretan to devour; akin to Old High German frezzan to devour, ezzan to eat — more at eat
Verb (2)
Middle English, back-formation from fret, fretted adorned, interwoven, from Anglo-French fretté, past participle of fretter to tie, probably from Vulgar Latin *firmitare, from Latin firmus firm
Noun (3)
perhaps from Middle French frete ferrule, from freter