The act of putting something (like a musical instrument or engine) out of proper adjustment or harmony; changing the tuning of something intentionally.
From 'de-' (reversing) + 'tune' (from Old French 'ton', meaning sound). The 'de-' prefix indicates the reversal of the tuning process. Emerged in the 20th century with musical and technical applications.
Radio engineers actually use detuning as a clever technique to reduce interference—by deliberately moving a receiver slightly off its target frequency, they can avoid overlapping signals from nearby stations. It's counterintuitive: sometimes being wrong is the right solution!
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