Chambers's Twentieth Century Dictionary…
“ Frill, fril, v.i. to ruffle, as a hawk its feathers, when shivering.—v.t. to furnish with a frill.—n. a ruffle: a ruffled or crimped edging of linen.—ns. Frilled′-liz′ard, a lizard with an extraordinary frilled membrane attached to the hinder part of the head, neck, and chest, and covering its shoulders; Frill′ing, frilled edging. [Usually conn. with O. Fr. friller, to shiver; but prob. related to furl.] ”
