backbench

n. 后座议员席
a. 后座议员的

名词:backbencher 

back.bench

n.（名词）
Chiefly British The rear benches in the House of Commons where junior members of Parliament sit behind government officeholders and their counterparts in the opposition party.
【多用于英国】 后座议员席：英下议院后排座的议员席，议会中职位较低的成员坐在政府官员和对立党成员的后面
New members of Congress considered as a group:
议会新成员：议会的一组新成员：
例句：
.a revolt of the backbench fueled by a powerful lobbying campaign.(Washington Post)
.被强大的游说议员运动煽动的由新议员组成的反抗活动.(华盛顿邮报)


【引伸】
backbench.er
n.（名词）