bounce up and down to spring up and down due to natural elasticity or from being jostled or thrown. The ball bounced up and down for an amazingly long time. I bounced up and down in the back of that truck for almost an hour. Disclaimer All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.