noun

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