frill (n.)

"wavy ornamental edging," 1801 (with a doubtful attestation from 1590s), of uncertain origin despite much speculation [see OED]; figurative sense of "useless ornament" first recorded 1893. Related: Frills.

frill (v.)

"to furnish with a frill," 1570s, from frill (n.) "ornamental bordering." Related: Frilled.