a country fighting in a war on the side of another country
cobelligerent in American English
(ˌkoʊbəˈlɪdʒərənt)
noun
a nation associated but not formally allied with another or others in waging war
cobelligerent in American English
(ˌkoubəˈlɪdʒərənt)
noun
a state or individual that cooperates with, but is not bound by a formal alliance to another in waging war
Word origin
[1805–15; co- + belligerent]This word is first recorded in the period 1805–15. Other words that entered Englishat around the same time include: Indo-European, backlash, diminishing returns, one-sided, polarizationco- is a prefix meaning “with,” “together,” “in association,” sometimes with the derivedsense “auxiliary, subsidiary” (coenzyme; copilot), and, in mathematics and astronomy, with the sense “complement” (codeclination)