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English definition of “nail sth down”

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nail sth down

verb uk phrasal verb with nail   /neɪl/ us  

(DECISION)

informal If you nail down an arrangement or decision, you fix and agree to the details of it: After a five-hour meeting, we finally nailed down a deal.

(UNDERSTAND)

US informal to understand something completely, or to describe something correctly: We haven't been able to nail down the cause of the fire yet.
(Definition of nail sth down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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