nail down
phrasal verbnail something down
- to fasten something in place with a nail or nails
- to reach an agreement or a decision, usually after a lot of discussion
- All the parties seem anxious to nail down a ceasefire.
nail somebody down (to something)
- to force somebody to give you a definite promise or tell you exactly what they intend to do
- She says she'll come, but I can't nail her down to a specific time.