fret (v.) Look up fret at
Old English fretan "devour, feed upon, consume," from Proto-Germanic compound *fra-etan "to eat up," from *fra- "completely" (see *per- (1)) + *etan "to eat" (see eat). Cognates include Dutch vreton, Old High German freggan, German fressen, Gothic fraitan.

Used of monsters and Vikings; in Middle English used of animals' eating. Notion of "wear away by rubbing or scraping" (c. 1200) might have come to this word by sound-association with Anglo-French forms of Old French froter "to rub, wipe; beat, thrash," which is from Latin fricare "to rub" (see friction). Figurative use is from c. 1200, of emotions, sins, vices, etc., "to worry, consume, vex" someone or someone's heart or mind, from either the "eating" or the "rubbing" sense. Intransitive sense "be worried, vex oneself" is by 1550s. Modern German still distinguishes essen for humans and fressen for animals. Related: Fretted; fretting. As a noun, early 15c., "a gnawing," also "the wearing effect" of awareness of wrongdoing, fear, etc.
fret (n.1) Look up fret at
"ornamental interlaced pattern," late 14c., from Old French frete "interlaced work, trellis work," probably from Frankish *fetur or another Germanic source (cognates: Old English fetor, Old High German feggara "a fetter, shackle") perhaps from the notion of "decorative anklet," or of materials "bound" together.
fret (n.2) Look up fret at
"ridge on the fingerboard of a guitar," c. 1500, of unknown origin, possibly from another sense of Old French frete "ring, ferule." Compare Middle English fret "a tie or lace" (early 14c.), freten (v.) "to bind, fasten" (mid-14c.).