mistune

mis- +‎ tune

• (verb) IPA^(key): /mɪsˈtjuːn/
• (noun) IPA^(key): /ˈmɪstjuːn/

mistune (third-person singular simple present mistunes, present participle mistuning, simple past and past participle mistuned)

1. (transitive) To tune wrongly.
   • 1568, William Cornishe [i.e., William Cornysh], “In the Fleete Made by Me William Cornishe otherwise Called Nyshwhete Chapelman with the Most Famose and Noble Kyng Henry the VII. His Reygne the XIX. Yere the Moneth of July. A Treatise betwene Trouth, and Information.”, in John Skelton, edited by J[ohn] S[tow], Pithy Pleasaunt and Profitable Workes of Maister Skelton, Poete Laureate, Imprinted at London: In Fletestreate, neare vnto St Dunstan-in-the-West by Thomas Marshe, →OCLC; republished as Pithy Pleasaunt and Profitable Workes of Maister Skelton, Poete Laureate to King Henry the VIIIth, London: Printed for C. Davis in Pater-noster Row, 1736, →OCLC, page 290:

     The Harpe.
     […]
     A harper with his wreſt maye tune the harpe wrong
     Mys tunying of an Inſtrument ſhal hurt a true ſonge

mistune (plural mistunes)

1. An incorrect tuning.

• Tsunemi, minuets, minutes, munites, mustine, muteins, mutines, untimes