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



























