Definition of mistune in English:

mistune

verb

  • 1To put out of tune, make discordant; to perform (music) out of tune; to tune (a musical instrument) wrongly.

  • 2with object To tune (radio equipment, etc.) wrongly.

Origin

Late Middle English (in an earlier sense). From mis- + tune, although attested slightly earlier.

Pronunciation

mistune

/ˌmɪsˈtʃuːn//ˌmɪsˈtjuːn/