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British Dictionary definitions for big fish

big fish

noun informal
  1. an important or powerful person
  2. a big fish in a small pond the most important or powerful person in a small group
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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