IPA: /ˈkaʊntərˌbloʊ/
KK: /ˈkaʊntərˌbloʊ/
A hit or strike that is given in response to another hit or strike.
After receiving a punch, he quickly delivered a counterblow to his opponent.
Counterblow → It is formed from "counter-" (meaning against) and "blow" (from Old English "blāwan", meaning to strike or hit). The word "counterblow" refers to a blow or strike that is delivered in response to another blow.
Think of delivering a strike "against" something — that's what a counterblow means.
No commonly confused words.