back seat
1 seat at the back of a car, etc 後座(位於汽车等後部的座位).
2 (idm 习语) a ,back-seat `driver (derog 贬) passenger in a car who gives unwanted advice to the driver 对司机胡乱指点的乘客. take a back seat (fig 比喻) behave as if one were unimportant; take a less prominent part in sth 装扮成不重要的角色; 在某事物中起较次要的作用.