nail down
verb1
to attach with nails
- Nail down the shelf, then paint it.
2
Idiomatic to make something (e.g. a decision or plan) firm or certain
- They haven't nailed down their vacation plans yet.
- Related terms
- copperfasten, pin down
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.