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British Dictionary definitions for first blood

first blood

noun
  1. the first killing or wounding in a fight or war
  2. the first damage or reverse inflicted on an opponent in a conflict
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