their head(s) offUsed with verbs such as отрезать or снести to mean doing something to their head(s), often translated as “cut their heads off” or “blow their heads off.” им is the dative form of “they,” while голову is singular in Russian but can refer collectively to multiple people’s heads.
RU: Если они нападут, охранники могут снести им голову.
EN: If they attack, the guards may blow their heads off.