the.com/reverberation

means The persistent echoing or resounding of a sound (or, figuratively, of an event's effects) as it repeats and gradually fades.

from From Latin reverberare — 're-' (back) plus 'verberare' (to beat or whip, from verber, 'a lash'). So the word's literal image is sound being beaten back, like a whip cracking against a wall and snapping into the air again. It passed through French into English in the 1500s, first used for physical echoing and light's reflection, later stretching to cover any shockwave of consequence that keeps striking long after the original blow.