flail

A tool used for threshing, consisting of a long handle (handstock) with a shorter stick (swipple or swingle) attached with a short piece of chain, thong or similar material.

When in one night, ere glimpse of morn, His shadowy flail hath threshed the corn That ten day-labourers could not end;

Huge fragments vaulted like rebounding hail, Or chaffy grain beneath the thresher's flail

A weapon which has the (usually spherical) striking part attached to the handle with a flexible joint such as a chain.

To beat using a flail or similar implement.

To wave or swing vigorously

Tangling with Ziv, Cameron caught him with a flailing elbow, causing the Israeli defender to go down a little easily. However, the referee was in no doubt, much to the displeasure of the home fans.

He stopped in his tracks – then, flailing his arms wildly in the air, began to stagger backwards.

To thresh.

To move like a flail.

He was flailing wildly, but didn't land a blow.

Undismayed he continued to flail with the broken half of it, denting many a helmet[.]