DICT.TW Dictionary Taiwan

 narrow down
      v 1: define clearly; "I cannot narrow down the rules for this
           game" [syn: pin down, peg down, nail down, narrow,
            specify]
      2: define clearly; "Can you pin down the difficulties" [syn: pin
         down]
      3: become more special; "We specialize in dried flowers" [syn:
         specialize, specialise, narrow] [ant: diversify, diversify]