[noun] [C] - (the seats in the British parliament used by) members who do not have official positions in the government or in an opposition political partyFollowing his resignation, the former Chancellor of the Exchequer has returned to the backbenches.The Prime Minister expects strong support from the Labour backbenches.Unless there is a surprise backbench revolt, the proposal is likely to be accepted.Compare frontbench.
BACKBENCH
Meaning of BACKBENCH in English
Cambridge English vocab. Кембриджский английский словарь. 2012