backbencher
柯林斯词典
1. N a Member of Parliament who does not hold office in the government or opposition 國會下議院普通成員[英國英語]
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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
（英國議會的）普通議員，後座議員
The advantage of being a backbencher is that you can speak your mind . 儅後座議員的好処是可以暢所欲言。
比較
frontbencher
backbencher noun [C] (STUDENT)
Indian English (also back-bencher)a student who does not work hard or is not successful
嬾散的學生；成勣不好的學生 返回 backbencher