Did you mean flail?
flail
noun
°A tool used for threshing, consisting of a long handle with a shorter stick attached with a short piece of chain, thong or similar material.
°A weapon which has the (usually spherical) striking part attached to the handle with a flexible joint such as a chain.
verb
°To beat using a flail or similar implement.
°To wave or swing vigorously.
synonyms: thrash