nail down

phrasal verb

Definition of nail down 

1 : to make (something, such as a victory) certain to happen They need to score another touchdown to nail down the victory.

2 : to find out or identify (something) exactly Her doctors haven't yet been able to nail down a diagnosis. They're trying to nail down the cause of our network problems.

3 : to make (something) definite or final nail down a decision

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Nglish: Translation of nail down for Spanish Speakers

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to enclose within walls

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