To roll up one's sleeves and clench one's fists, ready for a physical confrontation; to prepare to fight or brawl.
看到对方语气不善，他不由自主地攞袖揎拳，气氛顿时紧张起来。
Seeing the other party's unfriendly tone, he involuntarily rolled up his sleeves and clenched his fists, and the atmosphere immediately became tense.
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