gearbox
nounUK /ˈɡɪə.bɒks/
US /ˈɡɪr.bɑːks/
A gearbox is a box of parts in a car or machine that helps it change speed.
The mechanic fixed the gearbox so the car could drive smoothly again.
RELATED WORDS
OTHER MEANINGS
2. The metal casing that holds the gears of a machine.
Oil leaked from a crack in the gearbox.
3. A set of gears in a bicycle or other device that changes how fast it goes.
He shifted the gearbox to climb the steep hill.
4. The part of a wind turbine that speeds up the turning of the blades.
Engineers inspected the turbine's gearbox for wear.