olemus
kiirendav sõiduki ülekandesüsteemi komponent
= an accelerating component in the vehicle transmission system

ülevaateid
https://image.slidesharecdn.com/automobiletransmission-160326143020/95/automobile-transmission-gear-box-15-1024.jpg

https://en.wikipedia.org/wiki/Overdrive_(mechanics)

https://www.cjponyparts.com/resources/overdrive-explained