nail sth down - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “nail sth down”

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nail sth down

US phrasal verb with nail
 
 
/neɪl/ verb
to understand something completely, or to describe something correctly: We haven't been able to nail down the cause of the fire yet.Understanding and comprehendingDescribing and telling stories
(Definition of nail sth down from the Cambridge Learners Dictionary © Cambridge University Press)
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