v.1. To return something by kicking it: I'll roll the ball to you, and then you kick it back. The goalie kicked back the soccer ball.
2. To recoil unexpectedly and violently: Be careful with that power saw—if it kicks back, you could be badly injured. Hold the rifle tightly—otherwise it will kick back and bruise your shoulder.
3. To relax, especially by resting: I was too tired to work last night, so I just kicked back at home and watched TV.
4. Slang To pay someone in return for an illegal favor: The corrupt official kicked $1,000 back to the politicians who helped him get the grant money. If you can kick back some of your profits, I'll make sure you win that contract.