furl / fərl/ • v. [tr.] roll or fold up and secure neatly (a flag, sail, umbrella, or other piece of fabric): he shouted to the crew to furl sails | [as adj.] (furled) a furled umbrella. ∎ [intr.] poetic/lit. become rolled up; curl: [as adj.] (furled) the plant sends up cones of furled leaves. DERIVATIVES: furl·a·ble adj.