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The Collaborative International Dictionary
Fish-tail propeller

fishtail \fishtail\ v. i. to have the rear end skid from side to side, out of control: -- said of automobiles or other vehicles.

Fish-tail burner, a gas burner that gives a spreading flame shaped somewhat like the tail of a fish.

Fish-tail propeller (Steamship), a propeller with a single blade that oscillates like the tail of a fish when swimming.