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Old Bill

noun British slang
  1. a policeman
  2. the Old Bill (functioning as plural) policemen collectively or in general
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Word Origin

C20: of uncertain origin: perhaps derived from the World War I cartoon of a soldier with a drooping moustache
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012