flail

verb
1
to move around without control; to move your arms and legs around without control
بی‌اراده حرکت کردن, دست‌وپا زدن, بی‌اختیار تکان خوردن, جنباندن نامنظم
2
to hit somebody/something very hard, especially with a stick
شلاق زدن, ضربه زدن
noun
1
a tool that has a long handle with a short stick hanging from it, used especially in the past to separate grains of wheat from their dry outer layer, by beating the wheat
خرمنکوب