|Origin:||sack 'destruction of and stealing from a town' (16-21 centuries), from French sac ( SAC), in the phrase mettre A sac 'put in the bag', from Italian mettere a sacco|
1 British English informal
to dismiss someone from their job [= fire]:
They couldn't sack me - I'd done nothing wrong.
sack somebody from something
He was sacked from every other job he had.
sack somebody for (doing) something
He was sacked for being drunk.
to knock down the quarterback in American football
if soldiers sack a place, they go through it destroying or stealing things and attacking people:
The Goths sacked Rome.
sack outphrasal verb
to go to sleep:
He sacked out on the sofa.