名詞 flail:

1. an implement consisting of handle with a free swinging stick at the end; used in manual threshing

動詞 flail:

1. give a thrashing to; beat hard
   同義詞：thrash, thresh, lam
2. move like a flail; thresh about
   同義詞：thresh

1. The baby's legs flailed under the quilt.
   小孩的兩條小腿在被子下面亂動。
2. The dying lamb fell, its legs flailing (about) helplessly.
   小羊快要死了，倒在地上四條腿又踢又蹬。

flail

n.（名詞）
A manual threshing device consisting of a long wooden handle or staff and a shorter, free-swinging stick attached to its end.
連枷：一種由一個長木柄或棒和一個安在柄端上稍短的能自由搖動的棍棒組成的手工脫粒用具
v.（動詞）
flailed,flail.ing,flails
v.tr.（及物動詞）
To beat or strike with or as if with a flail:
用連枷打或似用連枷打：
例句：
flailed our horses with the reins.
用韁繩拍打我們的馬

To wave or swing vigorously; thrash:
用力地揮動或擺動；鞭打：
例句：
flailed my arms to get their attention.
揮動我的雙臂以引起他們的注意

To thresh using a flail.
用連枷脫粒
v.intr.（不及物動詞）
To move vigorously or erratically; thrash about:
用力或胡亂地移動；左右（或上下）擺動：
例句：
arms flailing helplessly in the water.
在水中無助亂擺的手臂

To strike or lash out violently:
猛烈地擊打：
例句：
boxers flailing at each other in the ring.
在拳擊場上互相猛擊的拳手

To thresh grain.
脫粒

來源：
Middle English
中古英語
from Old English flegil
源自 古英語 flegil
and from Old French flaiel
并源自 古法語 flaiel
both from Late Latin flagellum [threshing tool]
都源自 后期拉丁語 flagellum [脫粒工具]
from Latin flagrum [whip]
源自 拉丁語 flagrum [鞭子]