A strip of pleated fabric or paper used as decoration or trim.

(figurative) A substance or material on the edge of something, resembling such a strip of fabric.

(photography) A wrinkled edge to a film.

(figurative) Something extraneous or not essential; something purely for show or effect; a luxury.

(zoology) The relatively extensive margin seen on the back of the heads of reptiles, with either a bony support or a cartilaginous one.

(transitive) To make into a frill.

(intransitive) To become wrinkled.

(transitive) To provide or decorate with a frill or frills; to turn back in crimped plaits.