a large curved container with a flat top and bottom, made of wood or metal, and used for storing beer, wine etc:
The wine is aged in oak barrels.
barrels of beer
a unit of measurement for oil, equal to 159 litres
two million barrels of oil
the part of a gun that the bullets are fired through
to put someone in a situation in which they are forced to accept or do what you want:
The manager had us over a barrel - either we work on a Saturday or we lose our jobs.
5 [often in negatives]
to be very enjoyable:
Life is not exactly a barrel of laughs at the moment.