rotten apple

Noun

idiomatic

(idiomatic) A bad person, especially one who has a corrupting influence on others: a bad apple.

Japanese Meaning

悪い人、特に他人に悪影響を及ぼす人（堕落者、腐敗した人）

Everyone liked the team until one rotten apple started spreading rumors and undermining their trust.

皆はそのチームを好んでいたが、一人の悪者が噂を広めて信頼を損ない始めた。

Sense（1）

(idiomatic) A bad person, especially one who has a corrupting influence on others: a bad apple.

rotten apples

（ plural ）