WordWeb Online

1. Succeed in obtaining a position
   "He nailed down a spot at Harvard"
   - nail, peg
    
2. Define clearly
   "I cannot nail down the rules for this game"
   - pin down, peg down, 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

Derived forms: nailed down, nailing down, nails down

See also: nail

Type of: bring home the bacon, come through, deliver the goods, determine, end, succeed, terminate, win