This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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

verb-intransitive. To have the rear end of a forward-moving vehicle swerve from side to side out of control: The truck fishtailed on the icy road.

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

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

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

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

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

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

v. 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."

fishtailed    fishtailing    fishtails   

slow down    decelerate   

natural-draft    32-inch    minifridge    biosphere    hosing