IPA: /dɪˈtjuːn/
KK: /dɪˈtun/
To change the tuning of a musical instrument or electronic device so that it produces a different pitch or frequency than intended.
The technician had to detune the guitar to achieve the desired sound for the performance.
Past: detuned
Past Participle: detuned
Detune → It is formed from "de-" (meaning down or away) and "tune" (from Old French *ton*, meaning sound or tone). The word "detune" means to lower or alter the pitch of a sound or musical instrument.
Think of 'taking the sound down' ('de-') from its original 'tone' — that's why detune means to change the pitch of a sound.