english
1
general::
Phrase(s): nail something down 1. to secure something down by nailing it. • Please nail the floorboard down or someone will trip over it. • I’ll nail down these floorboards. 2. Go to pin something down.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Phrase(s): nail someone down (on something) Go to pin someone down (on something).
McGrawhill's American Idioms And Phrasal Verbs
3
general::
Establish conclusively, as in The reporter nailed down the story by checking all the facts. This metaphoric expression alludes to fixing or fastening something down with nails. [c. 1600]
American Heritage Idioms