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)

• billons
• billow
• billowed
• billowier
• billowiest
• billowing
• billows
• billowy
• billposter
• billposters
• bills
• billsticker
• billy
• billyboy
• billyboys
• Billy Bunter
• billy-can
• billycock
• billycocks
• billy goat
• billy goats
• billy-o
• billy-oh
• bilobar
• bilobate