In the British Parliament, a member of Parliament who sits in the back rows and does not hold a position in the government or opposition leadership.
From 'back' + 'bencher' (one who sits on a bench). This term originated in the 18th century British Parliament, where the physical seating arrangement—with senior politicians at the front and ordinary members at the back—gave rise to this distinct vocabulary.
Being a backbencher is paradoxical: you have a vote but little power, which is why some backbenchers become unexpectedly influential by uniting around a cause—they're the sleeping giant of Parliament that leaders learn to fear.
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