A chief or principal advocate of leveling or equality; historically, a leader among those seeking to reduce social hierarchy.
From 'arch-' meaning 'chief' and 'leveler' (one who levels), a term sometimes applied to radical egalitarians, especially during the English Civil War period.
During the English Civil War, the 'Levellers' were actually a real political movement advocating for democracy and equality—if someone called you an 'archleveler,' they meant you were dangerously radical, a word of insult before it became historical.
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