Learn what "that will seal the deal with dad" means, when people say it, and how to use it naturally in English.

It means this will be the final thing needed to make the agreement work or convince him.
From Blood Contract, Episode 43
Someone says a deal will be enough to convince the father.
Use this in business, negotiation, or relationship contexts when something finally secures agreement. It is somewhat idiomatic, so learners may search for the meaning of seal the deal.
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