embitters

使(积极品质或事物)变得较不美好或愉快；使(消极品质或事物)变得更糟或更令人不悦。

To cause (a positive quality such as happiness, or a thing such as an activity or one's life) to become less good or pleasurable; also, to make (a negative quality, or thing such as a disagreement) worse or more unpleasant.

使(某人或其感情)变得更加愤怒、怨恨或不友好；使恶化。

To cause (someone or their feelings) to become more angry, resentful, or unfriendly; to envenom.