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English definition of “flail”

flail

verb [I, T]
 
 
/fleɪl/ (also flail about/around)
to wave or move your arms and legs about energetically and in an uncontrolled way: The wasp came towards us and Howard started flailing his arms around.Shaking, swinging and vibrating
(Definition of flail from the Cambridge Learners Dictionary © Cambridge University Press)
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