Focus on the pronunciation of nail sb down
English definition of “nail sb down”
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.