to shake or shiver as with cold; as, the hawk frills.-to wrinkle; -- said of the gelatin film.-to provide or decorate with a frill or frills; to turn back. in crimped plaits; as, to frill a cap.-a ruffing of a bird's feathers from cold.-a ruffle, consisting of a fold of membrane, of hairs, or of feathers, around the neck of an animal.-a similar ruffle around the legs or other appendages of animals.-a ruffled varex or fold on certain shells.-a border or edging secured at one edge and left free at the other, usually fluted or crimped like a very narrow flounce.