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Verb: narrow down  ner-ow dawn [N. Amer], na-row dawn [Brit]
  1. Define clearly
    "I cannot narrow down the rules for this game";
    - pin down, peg down [informal], nail down, narrow, specify
     
  2. Become more focused on an area of activity or field of study
    "The investigation narrowed down to three suspects";
    - specialize, specialise [Brit], narrow

Derived forms: narrows down, narrowed down, narrowing down

See also: peg

Type of: alter, change, determine, vary

Antonym: broaden