Meaning of “cast pearls before swine” in the English Dictionary

English

"cast pearls before swine" in English

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cast pearls before swine

to offer something valuable or good to someone who does not know its value:

I'm afraid you're casting pearls before swine with your good advice - he won't listen.

(Definition of “cast pearls before swine” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)