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British Dictionary definitions for happen by

happen by

happen past, happen along or happen in

verb
  1. (intr, adverb) informal, mainly US to appear, arrive, or come casually or by chance
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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