backhander
noun
RareNot in standard dictionaries
1
A glass of wine given out of turn, the bottle having been handed backwards.
2
A blow with the back of the hand.
3
A bribe, a secret payment.
4
A shot played backhand, a backhand stroke.
5
A player who plays a backhand shot.
6
A surfer who approaches a swell with the wave behind them ("on their backhand") rather than facing the wave ("on their forehand").
#informal