To deliberately adjust or change the tuning of a musical instrument so it is no longer in the correct pitch.
Prefix 'de-' (away from, reversal) combined with 'tune' (to adjust to correct pitch). Modern term created by analogy with other 'de-' verbs.
Musicians sometimes intentionally detune their guitars to create different sounds—like when Metallica detuned for heavier riffs in the 1980s!
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