to show oneself in one's true colours―show one's true colours―throw off the mask
正体を顕す、本性を顕す、地金を顕す - 斎藤和英大辞典
(戦争なら)to assume the defensive―stand on the defensive―fight a defensive battle―(剣術なら)―place oneself on one's guard―(拳闘なら)―put oneself in a posture of defence―throw oneself into a defensive attitude
守勢を執る - 斎藤和英大辞典
to attack the enemy hammer and tongs―throw [fling, hurl] oneself upon the enemy―(相手が個人なら)―make a dead set at a man―(相手が仕事なら)―go to it, tooth and nail
無二無三に攻め立てる - 斎藤和英大辞典
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