1. Rebounding from an impact (or series of impacts); SYN. bouncing.
2. The quality of a substance that is able to rebound; SYN. bounciness.

1. To spring back; spring away from an impact; SYN. take a hop, spring, bound, rebound, recoil, ricochet.
2. To hit something so that it bounces, as of a ball.
3. To move up and down repeatedly; SYN. jounce.
4. To refuse to accept and send back.
5. To leap suddenly.
6. To eject from the premises.
7. To come back after being refused.

To return to the sender, used in reference to undeliverable e-mail.