The Collaborative International Dictionary of English v.0.48:
Rebound \Re*bound"\ (r[-e]*bound"), v. i. [Pref. re- + bound:
cf. F. rebondir.]
1. To spring back; to start back; to be sent back or
reverberated by elastic force on collision with another
body; as, a rebounding echo.
Bodies which are absolutely hard, or so soft as to
be void of elasticity, will not rebound from one
another. --Sir I.
2. To give back an echo. [R.] --T. Warton.
3. To bound again or repeatedly, as a horse. --Pope.
4. to recover, as from sickness, psychological shock, or
Rebounding lock (Firearms), one in which the hammer
rebounds to half cock after striking the cap or primer.