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!
through no fault of your own:
He seems to have lost the job through no fault of his own.
Synonyms and related words