Why this word is great
COBELLIGERENT — [Adjective] Carrying on war in conjunction with another power without a formal alliance. From co- ("together") + belligerent (from Latin belligerans, "waging war"). Unlike "ally" (which implies a treaty) or "neutral" (which implies abstention), "cobelligerent" describes the pragmatic calculus of shared enemies over shared ideals. It is the uneasy coordination of rival factions in a besieged city, the temporary ceasefire between warlords to repel an invader, or the reluctant convergence of two armies on a battlefield—each knowing the truce will dissolve the moment the common foe falls. A cobelligerent is not a friend, only a circumstantial accomplice in the arithmetic of survival.