adjective. Resembling or suggestive of the tail of a fish in shape or movement.

intransitive verb. To have the rear end of a forward-moving vehicle swerve from side to side out of control.

intransitive verb. To swing the tail of an airplane from side to side in order to reduce speed.

intransitive verb. to have the rear end skid from side to side, out of control: -- said of automobiles or other vehicles.

intransitive verb. a gas burner that gives a spreading flame shaped somewhat like the tail of a fish.

intransitive verb. a propeller with a single blade that oscillates like the tail of a fish when swimming.

transitive verb. to slow down by moving the tail sideways, of an airplane.

noun. The tail of a fish, or an object resembling this.

verb. To swing the back of a vehicle (originally an aircraft) from side to side.

verb. To move with the tail swinging from side to side in this way.

verb. slow down by moving the tail sideways

"Meanwhile Kelly Osbourne – who America seems to have decided is a "fashion expert" – is claiming that "the fishtail is a massive trend this year", which is great news if you're a cod."