Meaning of “account for sth” - Learner’s Dictionary

account for sth

phrasal verb with account us uk /əˈkaʊnt/ verb

to be part of a total number of something:

Oil accounts for 40% of Norway's exports.

to be the reason for something, or to explain the reason for something:

He'd had an argument with Caroline, which accounts for his bad mood this morning.
She was asked to account for the missing money.

(Definition of “account for sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)