Meaning of “fault” - Learner’s Dictionary

fault

noun uk us /fɔːlt/
sb's fault

B1 If something bad that has happened is someone's fault, they are responsible for it:

She believes it was the doctor's fault that Peter died.
at fault

B2 responsible for something bad that has happened:

I was at fault and I would like to apologize.

B2 [ C ] something that is wrong with something or with someone's character:

The car has a serious design fault.
One of his faults is that he's a bad loser.
find fault with sb/sth

to criticize someone or something, especially without good reasons

(Definition of “fault noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)