flail [fleɪl]

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vt.&vi.用连枷打；击打；n.连枷（脱粒用的工具）

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

No fence against flail. 飞来横祸不胜防。
His arms were flailing in all directions. 他的手臂胡乱挥舞着。