(especially of arms and legs) to move energetically in an uncontrolled way

A wasp came towards us and Howard started flailing his arms around. 一只黄蜂冲我们飞来，霍华德开始使劲挥舞胳膊。

She ran from the house in a terrible rage, her arms flailing in the air. 她怒不可遏地从房子里跑出来，手臂在空中乱挥乱打。

a tool consisting of a rod that hangs from a long handle, used especially in the past for threshing grain