Definition of 蛙の面に水
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(exp) like water off a duck's back; water on a frog's face
まさに蛙の面に水とはこのことだろう。
That's a clear case of "water off a duck's back".
まさに蛙の面に水とはこのことだろう。
That's a clear case of "water off a duck's back".