a person who shares the job of driving a vehicle with another He was there as co-driver of the truck and was asleep at the time. 他当时是卡车的副驾驶，当时正睡着。
- (in rally driving)
a person who sits next to the driver to give directions The co-driver is responsible for memorizing the route and relaying exact instructions. 副驾驶员负责记住路线并传达确切的指示。