Flail around means the same as flail.flail around 同 flail
He started flailing around and hitting Vincent in the chest.
他的手臂开始胡乱挥舞起来,打在了文森特胸口上。
2N-COUNT 连枷(脱粒用的农具) A flail is a tool which consists of a piece of wood or metal that can swing freely from a handle. Flails are used to beat crops such as corn in order to separate the grain from the rest of the plant. 连枷(脱粒用的农具)