Translation guide
The English word 'ally' can refer to a political/military partner, a supportive person or group, or the verb meaning to unite with. This guide covers how to express these ideas naturally in Japanese.
Referring to a nation or group that has a formal alliance with another.
Standard term for an allied nation. Used in news and formal contexts.
日本はアメリカの同盟国です。
Japan is an ally of the United States.
Refers to the alliance itself, but can also mean 'ally' in some contexts. Often used in compounds.
両国は同盟を結んだ。
The two countries formed an alliance.
Literally 'side' or 'supporter'. Can be used for allies in a conflict, but less formal than 同盟国.
彼らは戦争で我々の味方だった。
They were our allies in the war.
A person or group that supports you, especially in a social or political cause.
Common word for someone on your side, a supporter. Can be used in personal, professional, or activist contexts.
彼はいつも私の味方だ。
He's always my ally.
この問題では、彼女が味方になってくれた。
She became an ally on this issue.
Means 'supporter' or 'backer'. More formal than 味方, often used for financial or organizational support.
Means 'companion', 'comrade', or 'ally' in a group. Emphasizes belonging to the same group or sharing a goal.
The action of forming an alliance or joining forces.
Standard phrase for 'to form an alliance'. Used for countries, organizations, or groups.
その二国は同盟を結んだ。
The two countries allied with each other.
Idiomatic phrase meaning 'to join hands' or 'to team up'. More casual and often used for business or personal cooperation.
彼らは新事業で手を組んだ。
They allied for the new venture.
Verb meaning 'to side with' or 'to support'. Can be used for taking someone's side in a dispute.
彼はいつも弱い者に味方する。
He always allies himself with the weak.
味方 is a general term for someone on your side, from personal friends to wartime allies. 同盟国 specifically refers to a nation in a formal alliance. Use 味方 for everyday support and 同盟国 for geopolitical contexts.
The English word 'ally' is sometimes used as-is in Japanese (アライ), but this is limited to specific contexts like LGBTQ+ allyship. For general use, stick to the Japanese terms above.
He is a strong ally of the campaign.
彼は環境保護の仲間だ。
He's an ally in environmental protection.