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a thin flat membrane of the body of many sea creatures, used for swimming and keeping balance
a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
the cardinal number that is the sum of four and one
a stabilizer on a ship that resembles the fin of a fish
one of a set of parallel slats in a door or window to admit air and reject rain
a streamlined projection, usually found at the rear of a car
What is a "fin"?
A fin on a vehicle is a protruding feature often seen on the body of a car, particularly on older models or sports cars. It is designed to improve aerodynamics by reducing air resistance and increasing stability at higher speeds. Fins can also be purely decorative, adding a distinctive look to the vehicle. They are typically found along the rear end of the car, on the sides or back, and were more common in the mid-20th century, especially in the designs of American cars.
show the fins above the water while swimming
propel oneself through the water in a finning motion
equip (a car) with fins
