Phrasal Verbs
- 1to fasten something down with a nail or nails
- 2to reach an agreement or a decision, usually after a lot of discussion All the parties seem anxious to nail down a ceasefire.
to force someone to give you a definite promise or tell you exactly what they intend to do synonym pin somebodydown (to something/doing something) She says she'll come, but I can't nail her down to a specific time.