n a spot that has been worn away by abrasion or erosion
n an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)
there was a simple fret at the top of the walls
n 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
v worry unnecessarily or excessively
v be agitated or irritated
don't fret over these small details
v provide (a musical instrument) with frets
fret a guitar