In the first episode of Barkskins (France circa 1600s), an immigrant is watching a carriage full of women. then his master tells him "Do not grind your pearls"
He answers "Come on, they are beautiful"
And then his master replies "They are the king's, not of your station. It is men like myself who will have a wife to fill this land with sons and daughters."
Does anybody know what does "Do not grind your pearls" mean?