Usage Note
S'entretuer is always used reflexively (s'entretuer) and describes mutual killing, typically in war or conflict. It is formed from entre- (between/mutual) + tuer (to kill). The construction emphasises reciprocity — no single aggressor — and appears frequently in descriptions of civil wars or fratricidal strife.
Examples
"Les soldats s'entretuaient dans la tranchée."
Natural Translation
The soldiers were killing each other in the trench.

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