Definitions
1.verbTo cut the fins from a fish, shark, etc.
2.verb(Of a fish) to swim with the dorsal fin above the surface of the water.
3.verbTo swim in the manner of a fish."A neutrally buoyant diver does not need to fin to maintain depth."
4.verbTo provide (a motor vehicle etc) with fins.
5.nounThe act of removing a live shark's fin, and releasing the shark back into the sea.