The word "out-flanks" refers to the act of gaining an advantage by attacking from the side. Its antonyms would be "outmaneuvered," which means to be outwitted, or "outsmarted," which means to be outdone in intelligence or cleverness. Other antonyms include "outmatched," meaning to be overpowered or dominated, and "outdone," meaning to be surpassed or exceeded in performance. These words convey the opposite meaning of "out-flanks," suggesting that the subject has lost or failed to gain an advantage. When used in conversation, it is critical to understand the context of the situation to use the appropriate antonym for "out-flanks.