The term "out flanks" refers to an action of attacking someone or something by moving around its flank or side. Some common synonyms for "out flanks" include flanking, outmaneuvering, ambushing, outwitting, and outsmarting. Flanking involves attacking from the side, while outmaneuvering involves using superior tactics to gain an advantage. Ambushing involves attacking by surprise, while outwitting and outsmarting both refer to using intelligence or cleverness to gain an advantage. These synonyms are all useful in different contexts and can help to vary your language and avoid repetition in your writing or speech.