at find1 (14)WORD CHOICE: WORD CHOICE: fault, blame, mistakeIf someone causes something bad, you can say that it is their fault or that they are to blame• The accident was my fault. • Nobody is to blame for what happened. !!Do not say that someone 'has the/a etc fault'• We didn't think that it was our fault OR that we were to blame (NOT that we had any fault).!! Do not say that something is 'someone's blame'.Use faultto mean something that is wrong with a machine or system, or something that you could criticize about a person or thing• The car engine had developed a fault. • The book's only fault is that it is too long.Use mistaketo mean something that is wrong in someone's grammar, spelling, calculations, decisions etc• Please correct any mistakes (NOT faults) in my letter.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.