The crossword solution for the term 'REBOUND, AS SOUND' is 'ECHO'. An ECHO is a sound that is heard again after it has been reflected off of a surface. It is created when sound waves are reflected back to the listener after hitting an object. Echoes can be heard in many places, such as in a canyon or a large hall. They can also be heard in nature, such as when a bird call is repeated by another bird.