down
1.
to fasten sth down with a nail or nails
2.
to reach an agreement or a decision, usually after a lot of discussion :
All the parties seem anxious to nail down a ceasefire.
down
1.
to fasten sth down with a nail or nails
2.
to reach an agreement or a decision, usually after a lot of discussion :
All the parties seem anxious to nail down a ceasefire.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005