Definition of "Fret" :

noun: 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

noun: an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)

"There was a simple fret at the top of the walls."

noun: a spot that has been worn away by abrasion or erosion

noun: agitation resulting from active worry

verb: wear away or erode

verb: remove soil or rock

verb: cause friction

verb: be too tight; rub or press

verb: decorate with an interlaced design

verb: carve a pattern into

verb: be agitated or irritated

"Don't fret over these small details."

verb: gnaw into; make resentful or angry

verb: cause annoyance in

verb: worry unnecessarily or excessively

verb: become or make sore by or as if by rubbing

verb: provide (a musical instrument) with frets

"Fret a guitar."