flail
/fleɪl; flel/ n
tool consisting of a stick swinging from a long handle, used esp formerly to separate grain from chaff 连枷（有长柄的农具, 尤於旧时作打谷用）. flail, v
1 [I, Tn] (cause sth to) wave or swing about wildly （使某物）乱摇或乱摆
The dying lamb fell, its legs flailing (about) helplessly. 小羊快要死了, 倒在地上四条腿又踢又蹬.
flail one's arms/hands above one's head 将双臂[双手]举过头顶摇动.
2 [Tn] beat (sth) (as if) with a flail （似）用连枷打（某物）.