动一根毫毛

动一根毫毛

Literally means:

move a hair

Actually means:

do the slightest harm

毫毛 refers to the sot soft hair on the body of a person or bird.

It figuratively means a very small and insignificant thing. This phrase means doing the slightest harm. It is often used to indicate that one cannot tolerate the slightest harm done to a particular person or object, or it is impossible to do it.

毫毛，人或鸟兽身上的细毛。

比喻十分细小的东西。动一根毫毛，指十分轻微的触犯或损害。多用来表示不能容忍对某人或某物加以损害，或无法加以损害。