1 [countable/uncountable] the fact of being responsible for a bad or unpleasant situation
be someone’s fault: It’s my fault – I forgot to give him the message.
be someone’s fault (that): It’s not my fault that we’re late.
be someone’s own fault: If you didn’t get enough sleep, it’s your own fault.
be all someone’s fault: We’ve missed the plane and it’s all your fault!
be someone’s fault for doing something: It was partly the teacher’s fault for not explaining things clearly enough.
through no fault of your own: He seems to have lost the job through no fault of his own.
the fault lies with: If a child does not attend school, the fault lies with the parent.
Synonyms and related words