1. • noun - the cardinal number that is the sum of four and one
   • noun - one of a pair of decorations projecting above the rear fenders of an automobile
   • noun - one of a set of parallel slats in a door or window to admit air and reject rain
   • noun - a shoe for swimming
   • noun - a stabilizer on a ship that resembles the fin of a fish
   • noun - organ of locomotion and balance in fishes and some other aquatic animals
   • verb - equip (a car) with fins
   • verb - propel oneself through the water in a finning motion
   • verb - show the fins above the water while swimming
2. • A membranous appendage extending from the body of a fish or other aquatic animal, used for propelling, steering, or balancing the body in the water.
   • A fixed or movable airfoil used to stabilize an aircraft, a missile, or a projectile in flight.
   • A projecting vane used for cooling, as on a radiator or an engine cylinder.
   • See tail fin (n.
   • To equip with fins.
   • To emerge with the fins above water.
   • To swim, as a fish.
   • To lash the water with the fins.
   • A five-dollar bill.
3. • v - to equip with fins (external paddle-like structures)

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