Definition of nail someone down in English:

nail someone down

phrasal verb

  • Elicit a firm commitment from someone.

    ‘I can't nail her down to a specific date’
    • ‘Cos the last time a target was just a lofty goal, not a commitment or a promise. Let's nail him down this time.’
    • ‘I want people to know when they come to a show that it's going to be all over the place and that it's fun without having to nail us down to any other expectation.’
    • ‘We couldn't quite nail them down on their prices for the new service, but we can say that it will be comparable to other subscription services the company offers.’
    • ‘Now, I am not looking to nail you down about what material you want to put on - I understand that those things are dependent upon how the material shapes - but what time are we looking at?’