repercuss v.

early 15c., repercussioun, "act of driving back," from Old French répercussion (14c.) or directly from Latin repercusionem (nominative repercussio), noun of action 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).

Originally in medicine (Chauliac) with a specific sense of "act of driving back humors." Meaning "reverberation, echo" first recorded 1590s; the metaphoric extension is recorded from 1620s.