backhander

Short definition from Wiktionary

Noun

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