subtilize

Verb
  1. Mark fine distinctions and subtleties, as among words (synset 200651886)
    is a type of: discriminate, know apart - recognize or perceive the difference
  2. Make more subtle or refined (synset 200553215)
    is a type of: alter, change, modify - cause to change; make different; cause a transformation
    same as: rarefy, sublimate
  3. Make (senses) more keen (synset 200393460)
    is a type of: heighten, sharpen - make (one's senses) more acute
    same as: subtilise

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