fret

gnaw into; make resentful or angry

be too tight; rub or press

a small bar of metal across the fingerboard of a musical instrument; when the string is stopped by a finger at the metal bar it will produce a note of the desired pitch

be agitated or irritated

“don't fret over these small details”

carve a pattern into

cause annoyance in

decorate with an interlaced design

provide (a musical instrument) with frets

“fret a guitar”

a spot that has been worn away by abrasion or erosion

become or make sore by or as if by rubbing

cause friction

agitation resulting from active worry