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Adjective: co-belligerent
  1. Fighting together as allies against a common enemy
    "co-belligerent nations in World War II"
Noun: co-belligerent
  1. A nation or state that carries on war in connection with another, but is not a formal ally
    "Finland was a co-belligerent with Germany against the Soviet Union in World War II"

Derived forms: co-belligerents

Encyclopedia: Co-belligerent