嫉恶如仇 literally means 'to hate evil as one hates an enemy.' It describes a strong, uncompromising moral stance — someone who feels intense revulsion toward injustice, wrongdoing, or immorality, reacting with the same vigor and determination as if confronting a personal enemy. The four characters combine meaningfully: 嫉 (to detest), 恶 (evil or wickedness), 如 (as, like), and 仇 (enemy or foe). This idiom emphasizes not just disapproval, but active, principled opposition.

It’s commonly used to praise upright, courageous individuals — such as honest officials, whistleblowers, or activists — whose integrity drives them to confront corruption or abuse. Though vivid and powerful, it carries a formal, literary tone and appears most often in written Chinese, historical narratives, or moral commentary rather than casual speech. It reflects Confucian ideals of righteousness (义) and moral courage, and is sometimes associated with chivalric or heroic figures in classical literature.