1. to waste something good or valuable on someone who won’t appreciate or understand it

1. Serving gourmet food to Marc is like casting pearls before swine. He likes fast food and jelly sandwiches.

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

3. Taking your young children to Europe would be like casting pearls before swine—they are too young to appreciate it.