Dictionary

A round vessel or cask, of greater length than breadth, and bulging in the middle, made of staves bound with hoops, and having flat ends or heads. Sometimes applied to a similar cylindrical container made of metal, usually called a drum.

Example: a cracker barrel

The quantity which constitutes a full barrel: the volume or weight this represents varies by local law and custom.

A solid drum, or a hollow cylinder or case

Example: the barrel of a windlass;  the barrel of a watch, within which the spring is coiled.

A metallic tube, as of a gun, from which a projectile is discharged.

To put or to pack in a barrel or barrels.

To move quickly or in an uncontrolled manner.

Example: He came barrelling around the corner and I almost hit him.