(UK, formerly Australia, slang) a five-pound (£5) note; the sum of five pounds.
(US, slang, dated) a five-dollar bill; the sum of five dollars.
(film, television, road signs) The finish, the end
(ichthyology) One of the appendages of a fish, used to propel itself and to manoeuvre/maneuver.
A device worn by divers and swimmers on their feet.
A hairstyle, resembling the fin of a fish, in which the hair is combed and set into a vertical ridge along the top of the head from about the crown to the forehead.
A sharp raised edge (generally in concrete) capable of damaging a roof membrane or vapor retarder.
A similar appendage of a cetacean or other marine animal.
A similar structure on the tail of a bomb, used to help keep it on course.
A thin, rigid component of an aircraft, extending from the fuselage and used to stabilise and steer the aircraft.
An extending part on a surface of a radiator, engine, heatsink, etc., used to facilitate cooling.
verb
(intransitive) (Of a fish) to swim with the dorsal fin above the surface of the water.
(intransitive) To swim in the manner of a fish.
(transitive) To cut the fins from a fish, shark, etc.
(transitive) To provide (a motor vehicle etc) with fins.