Literally 'tuck hands in sleeves and watch from the side' — the image of someone deliberately keeping their hands hidden in their sleeves while others struggle.
Miànduì bù gōngzhèng de shì, bù yīnggāi xiùshǒupángguān.
In the face of injustice, one shouldn't be a bystander.
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history
This idiom dates back to the Song dynasty. In ancient Chinese clothing, wide sleeves could easily conceal tucked-in hands — a posture of deliberate inaction.
