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.