fish·tail 
(fĭshtāl′)
(fĭshtāl′)adj.
Resembling or suggestive of the tail of a fish in shape or movement.
intr.v. fish·tailed, fish·tail·ing, fish·tails
1. 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.
2. To swing the tail of an airplane from side to side in order to reduce speed.