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English definition of “nail sb down”

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nail sb down

phrasal verb with nail
 
 
/neɪl/ verb [T] informal
to make someone give you exact details or a firm decision about something: nail sb down on sth We've been trying to nail them down on the specific points of the agreement for the past six months.nail sb down to sth Things are getting urgent so we need to nail them down to a delivery date.
(Definition of nail sb down from the Cambridge Business English Dictionary © Cambridge University Press)
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