to be ready and eager to get started on a task or activity

听说要开始春耕了，大家个个捋臂揎拳，干劲十足。

to push up one's sleeves and bare one's fists, indicating readiness for a physical confrontation or a challenge

那大汉气得捋臂揎拳，恨不得立刻冲上去跟人较量。