backbencher
noun [ C ] uk/ˌbækˈben.tʃər/ us/ˌbækˈben.tʃɚ/
(MP)
（英国议会的）普通议员，后座议员
a member of the UK parliament who does not have any official position in the government or in one of the opposing parties
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。
Compare: frontbencher
(STUDENT)
Indian English (also back-bencher)懒散的学生；成绩不好的学生
a student who does not work hard or is not successful