Definition of nail someone down in English:

nail someone down

Elicit a firm commitment from someone: I can’t nail her down to a specific date
More example sentences
  • 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.
  • Cos the last time a target was just a lofty goal, not a commitment or a promise. Let's nail him down this time.
  • 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?
See parent entry: nail

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true