见义勇为 jiànyì-yǒngwéi usually of a passer-by who comes across a critical situation
(idiom, from the Analects) (usually of a passer-by who comes across a critical situation) to step in and help; to take brave or selfless action
How to remember 见义勇为: 见 see + 义 right conduct + 勇 brave + 为 for = usually of a passer-by who comes across a critical situation.
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How it is used
- To step in bravely and do what's right when someone is in danger - 见义勇为的英雄 (jiànyì-yǒngwéi de yīngxióng) a have-a-go hero.
- From the Analects; strongly praising, often used of a passer-by who intervenes to help a stranger.
- The moral opposite of 袖手旁观 (standing by and doing nothing) - 不能袖手旁观 (bù néng xiùshǒu-pángguān) can't just stand by.