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Definition 2024

detune ‎(third-person singular simple present detunes, present participle detuning, simple past and past participle detuned)

(music) To intentionally lower or raise the pitch produced by a musical instrument. Often done to produce sounds not normally possible, or in the case of stringed instruments to reduce tension for the purposes of shipping or maintenance.
Some avant-garde composers request that performers detune their instruments before playing.
(electronics) To alter the capacitance of a circuit such that its resonant frequency differs from the incoming frequency.

intentionally lower or raise the pitch produced by a musical instrument

alter the capacitance of a circuit such that its resonant frequency differs from the incoming frequency