Dictionary entry

Twill

Webster's Dictionary 1913

Twill (?), v. i. [imp. & p. p.Twilled (?); p. pr. & vb. n.Twilling.] [Scotch tweel; probably from LG. twillen to make double, from twi- two; akin to AS. twi-, E. twi- in twilight. See Twice, and cf. Tweed, Tweel.] To weave, as cloth, so as to produce the appearance of diagonal lines or ribs on the surface.