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From The Collaborative International Dictionary of English v.0.48:
Outflank \Out*flank"\, v. t. 1. (Mil.) To go beyond, or be superior to, on the flank; to pass around or turn the flank or flanks of. [1913 Webster] 2. Hence: To outmaneuver in a competition; to bypass a competitor's main defenses. [PJC]