detune /dē-tūnˈ/

1. To alter the oscillations of (violin strings, an electronic circuit, etc)
2. To reduce the performance and efficiency of (a motor-car engine)

• greyhen
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• greylag
• greylag geese
• greylag goose
• greylags
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• greyness
• greynesses
• grey-out
• grey-outs
• grey owl