to  cast pearls before swine
<abbr style="text-decoration: underline;" title="cast / throw" > cast</abbr>
kast
kast
pearls
θrəʊ
threw
before
pɜ:lz
pēlz
swine
bɪfɔ:
bifaw
[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
慣用句
Helping him again would just be casting pearls before swine. 

また彼を助けるなんて、猫に小判だよ。

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