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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, nail down, narrow, specify
  2. Become more focus on an area of activity or field of study
    - specialize, specialise [Brit], narrow

Derived forms: narrowed down, narrows down, narrowing down

See also: narrow

Type of: alter, change, determine, vary