backseat

/B AE0 K S IY1 T/
noun
  1. 1

    Any of the seats in the rear of a vehicle.

  2. 2

    (especially in the expression take a back seat) A lesser or inferior position; a position of deliberate noninvolvement, in which decision-making or leadership is left to others.

Source: https://en.wiktionary.org/wiki/back%20seat, https://en.wiktionary.org/wiki/backseat