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nail sth down

(UNDERSTAND) US informal phrasal verb with nail
 
 
/neɪl/ verb

Definition

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 comprehendingDefining and explaining
(Definition of nail sth down (UNDERSTAND) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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