Verb narrow down has 3 senses
  1. pin down, peg down, nail down, narrow down, narrow, specify - define clearly; "I cannot narrow down the rules for this game"
    --1 is one way to determine
    Sample sentences:
    Somebody ----s something
    Somebody ----s something PP
  2. pin down, narrow down - define clearly; "Can you pin down the difficulties"
    --2 is one way to focus, focalize, focalise, sharpen
    Sample sentences:
    Somebody ----s something
    Something ----s something
  3. specialize, specialise, narrow, narrow down - become more special; "We specialize in dried flowers"
    --3 is one way to change, alter, vary
    Sample sentences:
    Something ----s
    Somebody ----s
    Something is ----ing PP
    Somebody ----s PP
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