Real Dictionary

furl
verb: When you furl something made of fabric such as an umbrella, sail, or flag, you roll or fold it up because it is not going to be used.

furl in American English
a roll or coil of something furled
to become curled or rolled up
to roll up tightly and make secure, as a flag to a staff or a sail to a spar
intransitive verb: to become furled
transitive verb: to gather into a compact roll and bind securely, as a sail against a spar or a flag against its staff

furl in British English
noun: the act or an instance of furling
verb: to roll up (an umbrella, a flag, etc) neatly and securely or (of an umbrella, flag, etc) to be rolled up in this way

furl. in American English
abbreviation: furlough