echo

ˈɛkəʊ

noun

a sound or sounds caused by the reflection of sound waves from a surface back to the listener.

the walls threw back the echoes of his footsteps

reverberation,reverberating,reflection,resounding,ringing,repetition,repeat,reiteration,answer

verb

(of a sound) be repeated or reverberate after the original sound has stopped.

their footsteps echoed on the metal catwalks