Meaning of “nail sth down” in the English Dictionary

"nail sth down" in Business English

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nail sth down

phrasal verb with nail uk /neɪl/ us verb [ T ] informal

to agree the details of a decision, an agreement, etc. so that something can happen:

The decision of who would be appointed Chief Executive was made months before the other terms of the merger were nailed down.
The government hopes to nail down a deal with China by year's end.

(Definition of “nail sth down” from the Cambridge Business English Dictionary © Cambridge University Press)