jeter des perles aux pourceaux

Literally, “to throw pearls to the swine”. From Matthew 7:6.

• IPA^(key): /ʒə.te de pɛʁl o puʁ.so/

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jeter des perles aux pourceaux

1. (figuratively) to cast pearls before swine

   Synonym: donner de la confiture à des cochons