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Verb: nail down  neyl dawn
  1. Attach something somewhere by means of nails
    - nail
  2. Define clearly
    "I cannot nail down the rules for this game";
    - pin down, peg down [informal], narrow down, narrow, specify
  3. Make final; put the last touches on; put into final form
    "let's nail down the proposal";
    - finalize, finalise [Brit], settle
  4. [informal] Succeed in obtaining a position
    "He nailed down a spot at Harvard";
    - nail [informal], peg [informal]

Derived forms: nailing down, nails down, nailed down

Type of: attach, bring home the bacon [informal], come through, come up trumps [Brit, informal], deliver the goods, determine, end, succeed, terminate, turn up trumps [Brit, informal], win