fin
/fin/
noun
a flattened appendage on various parts of the body of many aquatic vertebrates and some invertebrates, including fish and cetaceans, used for propelling, steering, and balancing.
verb
swim underwater by means of flippers.
"I finned madly for the surface"
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What is fin slang for?
What does fin mean?
Does fin mean the end?
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The meaning of FIN is an external membranous process of an aquatic animal (such as a fish) used in propelling or guiding the body.
noun · a membranous, winglike or paddlelike organ attached to any of various parts of the body of fishes and certain other aquatic animals, used for propulsion, ...