backbencher
柯林斯词典
1. N a Member of Parliament who does not hold office in the government or opposition 国会下议院普通成员[英国英语]
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backbencher /ˈbækˈbɛntʃə/
剑桥词典
backbencher noun [C] (MP)
a member of the UK parliament who does not have any official position in the government or in one of the opposing parties
（英国议会的）普通议员，后座议员
The advantage of being a backbencher is that you can speak your mind . 当后座议员的好处是可以畅所欲言。
比较
frontbencher
backbencher noun [C] (STUDENT)
Indian English (also back-bencher)a student who does not work hard or is not successful
懒散的学生；成绩不好的学生 返回 backbencher