nail down Meaning, Definition & Usage

1. verb succeed in obtaining a position
   nail; peg.
   
   • He nailed down a spot at Harvard
2. verb define clearly
   pin down; narrow down; narrow; specify; peg down.
   
   • I cannot narrow down the rules for this game
3. verb make final; put the last touches on; put into final form
   settle; finalise; finalize.
   
   • let's finalize the proposal

WordNet