Bounce is a word for an up and down movement or recovery — like a ball's bounce on the pavement or the stock market's rise after a crash.
Bounce can be a noun or a verb. A basketball player bounces a ball on the floor and it springs back into her hand. Trampolines have a lot of bounce in them; that's why they are fun to jump on. Good dance music makes you want to bounce up and down. The phrase “bounce back” describes how you might recover after a bad situation. Did you slip and suffer a painful bounce on the floor? Some hot chocolate will help you "bounce back."