1. noun A dance characterized by aggressive and overtly sexualized hip movements, either by a single dancer or between two dance partners. It was a little disconcerting to see teenagers doing the bump and grind at the prom.

2. noun Any series or combination of rough, jarring movements, especially as in whitewater kayaking or road racing. The bump and grind through those last rapids gave me a headache!

3. verb To dance in a manner characterized by aggressive and overtly sexualized hip movements, either by a single dancer or between two dance partners. It was a little disconcerting to see teenagers bumping and grinding at the prom.

4. verb To perform any series or combination of rough, jarring movements, especially as in whitewater kayaking or road racing. We're going to have to bump and grind through this next section of the river.