seal the deal

[ seel thuh deel ]

idiom

1. to complete or successfully negotiate an agreement:

   If our top executive can't seal the deal, no one can.

2. to secure or ensure a successful conclusion: A last-minute goal sealed the deal for Baltimore.

   He had aced both interviews, and if the director liked him that would seal the deal.

   A last-minute goal sealed the deal for Baltimore.

Word History and Origins

Origin of seal the deal¹

First recorded in 1950–55