back·seat 
/ˈbækˈsi:t/ noun
plural back·seats /ˈbækˈsi:t/ noun [count] : a seat in the back of something (such as a car)
take a backseat
: to be or become less important, active, or powerful — often + to ▪ He refuses to take a backseat to anyone. [=he refuses to let anyone have more power or control than he has]
