(at ceremonies) the command to turn the head and eyes to the left in salute.
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British Dictionary definitions for eyes left
military a command to troops to look left, esp as a salute when marching
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