cobelligerent

noun

co·​bel·​lig·​er·​ent ˌkō-bə-ˈlij-rənt 

-ˈli-jə-

: a country fighting with another power against a common enemy

cobelligerent adjective

Examples of cobelligerent in a Sentence

Recent Examples on the Web

Some American officials assert that as a matter of international law, the provision of weaponry and intelligence to the Ukrainian Army has made the United States a cobelligerent, an argument that some legal experts dispute. —New York Times, 19 Mar. 2022

Word History

First Known Use

1813, in the meaning defined above