make the cheese more binding

verb2

1. •
   (US) To add complication to a situation.

   • After all that the car wouldn't start and, to make the cheese more binding, Jack had taken my jumper cables.
2. •
   (US) To clinch a deal or agreement.

   • Why bother the title company with opening an escrow, making a search, when your deal might “flop”? Wait until you get that additional deposit to make the “cheese more binding.” — 1951