ADJ

beer, wine

VERB + BARREL

fill
They filled the barrels with cider

BARREL + VERB

contain sth

PREP

a/per ~
The price of oil had fallen to $16 per barrel
by the ~
Beer is sold by the barrel
~ of
a barrel of beer/oil

ADJ

gun, rifle
I felt the gun barrel at my head

VERB + BARREL

look down, peer/squint along
She found herself looking down the barrel of a gun. Pulling his rifle to his shoulder he squinted along the barrel

BARREL + VERB

point

PHRASES

the barrel of a gun