To bare one's fists and wave one's sleeves; to make an aggressive or menacing gesture; to prepare for a fight or confrontation in a rude manner.
他一听到这个消息，立刻揎拳舞袖，准备和对方理论一番
As soon as he heard the news, he immediately bared his fists and waved his sleeves, ready to argue with the other party.
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