noun British slang
the Old Bill (functioning as plural) policemen collectively or in general
Words That Are Older Than You ThinkThe first citation of "OMG" in the Oxford English Dictionary appears in a 1917 letter from the British admiral John Arbuthnot Fisher to Winston Churchill.
Word Origin for Old Bill
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