detune
/diːˈtjuːn/verb
with obj.
1- cause (a musical instrument) to become out of tune使（乐器）走调。
1.1
- usu. as adj. detuned reduce the performance or efficiency of (a motor vehicle or engine) by adjustment（通过调节）降低（汽车、发动机的）工作性能或效率。
1.2
- alter the wavelength of the light emitted by (a laser)改变（激光）波长。