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repercussion (n.)

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.

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Definitions of repercussion from WordNet

repercussion (n.)
a remote or indirect consequence of some action;
his declaration had unforeseen repercussions
Synonyms: reverberation
repercussion (n.)
a movement back from an impact;
Synonyms: recoil / rebound / backlash
From wordnet.princeton.edu