A change of direction of motion after hitting the ground or an obstacle.

A movement up and then down (or vice versa), once or repeatedly.

An email return with any error.

To change the direction of motion after hitting an obstacle.

“The tennis ball bounced off the wall before coming to rest in the ditch.”

To move quickly up and then down, or vice versa, once or repeatedly.

“He bounces nervously on his chair.”

To cause to move quickly up and down, or back and forth, once or repeatedly.

“He bounced the child on his knee.”