bounce
verb
°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."
noun
°A change of direction of motion after hitting an obstacle.
°A movement up and then down (or vice versa), once or repeatedly.
synonyms: bounce back, rebound, bob, rebound more» , bob, bobbing, bouncing, ups, mad ups