back seat
1 seat at the back of a car, etc 後座(位於汽車等後部的座位).
2 (idm 習語) a ,back-seat `driver (derog 貶) passenger in a car who gives unwanted advice to the driver 對司機胡亂指點的乘客. take a back seat (fig 比喻) behave as if one were unimportant; take a less prominent part in sth 裝扮成不重要的角色; 在某事物中起較次要的作用.