detune
verbEtymology From de- + tune.
1
Entertainment, Lifestyle, Music To intentionally lower or raise the pitch produced by a musical instrument, often to produce sounds not normally possible, or to reduce tension in a stringed instrument for the purpose of shipping or maintenance.
- Some avant-garde composers request that performers detune their instruments before playing.
2
Engineering, Natural sciences, Physical sciences To alter the resonant frequency of a tuned system so that it is slightly different from a specified target frequency.