verb (used with object)

to go or extend beyond the flank of (an opposing military unit); turn the flank of.
to outmaneuver or bypass.

Origin of outflank

First recorded in 1755–65; out- + flank
Related formsout·flank·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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verb (tr)

to go around the flank of (an opposing army)
to get the better of
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

Word Origin and History for outflank

1765, from out (adv.) + flank (v.). Figurative use from 1773. Related: Outflanked; outflanking.

Online Etymology Dictionary, © 2010 Douglas Harper