1An ally, supporter, or someone on your side — used both in literal conflict contexts (the opposing side's counterpart) and in everyday contexts for someone who has your back. Common in set phrases like 正義の味方 (defender of justice) and 心強い味方 (a reassuring ally). The kanji are ateji.
何があっても私はあなたの味方だよ。
No matter what happens, I'm on your side.
彼は子どもの頃から正義の味方になりたかった。
Ever since childhood, he wanted to be a champion of justice.
この辞書は語学学習者の心強い味方だ。
This dictionary is a reliable ally for language learners.
敵か味方か、はっきりさせてほしい。
I want you to make it clear whether you're friend or foe.
2To take someone's side; to support or back someone up. Used as 〜の味方をする or 〜に味方する, with a nuance of deliberately choosing to stand with the person.
母はいつも妹に味方する。
My mother always sides with my little sister.
今回は運も味方してくれた。
This time, luck was on my side too.
誰も自分の味方をしてくれず、孤立した気分だった。
No one took my side, and I felt isolated.