rub in

verb3

1. •
   To apply by rubbing.

   • Flattening chicken breast halves serves two purposes: It provides more surface area to rub in the Greek-influenced seasoning, and it ensures that the chicken cooks quickly. — 2006
2. •
   To make a point in an irritatingly emphatic manner.

   • Postcards from Florida might mean someone is rubbing in the fact he or she has been lounging on the white, sandy beaches — 2003
3. •
   Of butter, to mix in by rubbing.