clench one’s fists and roll up one’s sleeves—pose for a fight ❍ 出到大门外，汪为露还～，要打那侯小槐。(《醒世因缘》三十五) When they were outside the front gate,Wang Weilu clenched his fists and rolled up his sleeves in an attempt to beat Hou Xiaohuai.
撺拳拢袖cuān quán lǒnɡ xiù
握紧拳头，卷起袖口。形容准备动武。be ready to fight, pose for a fight