back bench
noun
1- (in the UK) any of the benches behind the front benches on either side of the House of Commons, occupied by members of parliament who do not hold office in the government or opposition（英国下院的）后座议员席, 普通议员席：
as modifier back-bench MPs.下院普通议员。
1.1
the back benches
these members of parliament下院后座议员, 下院普通议员。
派生词