ally

verb

become an ally or associate, as by a treaty or marriage
条約または結婚によってのように、盟友になるか、結びつく
- He allied himself with the Communists
  彼は共産主義者と同盟を結んだ

noun

a friendly nation
友好的な国家
an associate who provides cooperation or assistance
協力または補助を提供する仲間
- he's a good ally in fight
  彼は、闘志の良い盟友である

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