to cast pearls before swine
[cast|throw] {one's} pearls before swine

英語での「 cast pearls before swine」の定義と意味

to cast pearls before swine
01

猫に小判, ありがたみのない相手に尽くす

to do good things and waste valuable resources for ungrateful people
to [cast|throw] pearls before swine definition and meaning
idiom
I spent hours writing a thoughtful email to my boss, but he did n't even bother to read it. It felt like throwing pearls before swine.
また彼を助けるなんて、猫に小判だよ。
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