n. & v.
n. 1 an ornamental pattern made of continuous combinations of straight lines joined usu. at right angles. 2 Heraldry a device of narrow bands and a diamond interlaced.
v.tr. (fretted, fretting) 1 embellish or decorate with a fret. 2 adorn (esp. a ceiling) with carved or embossed work.
[ ME f. OF frete trellis-work and freter (v.) ]