HSK 7-9
见义勇为
jiànyì-yǒngwéi(idiom, from the Analects) (usu. of a passer-by who comes across a critical situation) to step in and help; to take brave or selfless action
路人见义勇为救下落水儿童。
Lù rén jiàn yì yǒng wéi jiù xià luò shuǐ ér tóng.
A passerby bravely stepped in and saved a child from the water.
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Appears across levels (7-9) in the HSK 3.0 word list.