Give something of value of someone who won't appreciate it, as in The old professor felt that lecturing on Dante to unruly undergraduates would be casting pearls before swine. This term comes from the New Testament (Matthew 7:6), appearing in Tyndale's translation (1526). It was repeated often by writers from Shakespeare to Dickens and remains current.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use cast pearls before swine in a sentence
I am going to follow the example of the man who cast pearls before swine—I'm going to cast you a pearl from one of my own poems.The Landloper | Holman Day
Some would not rightly appreciate the value of your frankness, and never cast pearls before swine.Charlotte Bront | T. Wemyss Reid
If we cast pearls before swine, my boy, we must not be surprised to find them taken for the seeds of cabbage-heads.The Orpheus C. Kerr Papers. Series 3 | Robert H. Newell
Herewith I pause, for why should I cast pearls before swine?The Works of Robert Louis Stevenson - Swanston Edition Vol. 24 (of 25) | Robert Louis Stevenson