IPA: /ˈɡɪrʃɪft/
KK: /ɡɪrʃɪft/
A part of a vehicle that allows the driver to change gears in the transmission system, helping to control the speed and power of the vehicle.
He shifted into a higher gear using the gearshift to accelerate on the highway.
Gearshift → It is formed from "gear" (from Old English *gier*, meaning a mechanism for transmitting power) and "shift" (from Old English *scyftan*, meaning to change or move). The word "gearshift" refers to the mechanism that changes the gears in a vehicle.
Think of a 'mechanism for transmitting power' ('gear') that you 'change' ('shift') to control a vehicle's speed.
No commonly confused words.