nail down


nail down (http://definr.com/nail down)

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