water off a duck's back

名词 n.
中文释义

英文释义

名词 n.
  1. Something potentially harmful or hurtful, such as criticism or insult, that nevertheless has no effect or impact on the target. uncountable
    — She's always going on at him about something, but to him it's all water off a duck's back.

词源

From the idea that water rolls easily off a duck's back and does not penetrate the duck's feathers.
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