中文翻译与英英解释

〔美口〕坐在后座乱指点司机的人；多管闲事的人；政治评论家。

driver:    n. 1.驱逐者，驱赶者；(火车的)司机；(汽车等的)驾 ...

A backseat driver is a vehicle passenger in the back seat who is not controlling the vehicle, and seems to be uncomfortable with the skills of the driver and/or wants to tutor the driver while the driver is at the wheel.