repercussion (n.)

early 15c., "act of driving back," from Middle French répercussion (14c.) or directly from Latin repercusionem (nominative repercussio), from past participle stem of repercutere "to strike or beat back; shine back, reflect; echo," from re- "back" (see re-) + percutere "to strike or thrust through" (see percussion). Meaning "reverberation, echo" first recorded 1590s; the metaphoric extension is recorded from 1620s.