Verb nail down has 3 senses
  1. nail down, nail, peg - succeed in obtaining a position; "He nailed down a spot at Harvard"
    --1 is one way to succeed, win, come through, bring home the bacon, deliver the goods
    Sample sentence:
    Somebody ----s something
  2. pin down, peg down, nail down, narrow down, narrow, specify - define clearly; "I cannot narrow down the rules for this game"
    --2 is one way to determine
    Sample sentences:
    Somebody ----s something
    Somebody ----s something PP
  3. finalize, finalise, settle, nail down - make final; put the last touches on; put into final form; "let's finalize the proposal"
    --3 is one way to end, terminate
    Sample sentence:
    Somebody ----s something
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