furl (v.) Look up furl at Dictionary.com
1550s, of uncertain origin, possibly from Middle French ferler "to furl," from Old French ferliier "chain, tie up, lock away," perhaps from fer "firm" (from Latin firmus; see firm (adj.)) + -lier "to bind" (from Latin ligare). Also said to be a shortening of earlier furdle "to furl or fold." Related: Furled; furling. As a noun from 1640s.