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Verb: untune  ,ún't(y)oon
Usage: rare
  1. Cause to be out of tune
    "Don't untune that string!"
     
  2. Cause to lose one's composure
    "The bad news untuned his normally calm demeanour";
    - upset, discompose, disconcert, discomfit

Derived forms: untunes, untuned, untuning

Type of: alter, arouse, change, elicit, enkindle [literary], evoke, kindle, modify, provoke, raise

Antonym: tune