Definition of 'fin'

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Noun

1. the cardinal number that is the sum of four and one
      Synonyms: five 5 V cinque quint quintet fivesome quintuplet pentad Phoebe Little Phoebe
2. one of a pair of decorations projecting above the rear fenders of an automobile
      Synonyms: tail fin tailfin
3. one of a set of parallel slats in a door or window to admit air and reject rain
      Synonyms: louver louvre
4. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
      Synonyms: flipper
5. a stabilizer on a ship that resembles the fin of a fish
6. organ of locomotion and balance in fishes and some other aquatic animals

Verb

1. equip (a car) with fins
2. propel oneself through the water in a finning motion
3. show the fins above the water while swimming; "The sharks were finning near the surface"
      Synonyms: break water

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