Meaning of "fault" in Essential American English Dictionary

fault

noun us /fɔlt/
be someone’s fault

B1 If something bad that happened is someone’s fault, he or shemade it happen:

The accident was not my fault.

something that is wrong with something:

The car has a serious design fault.

something that is wrong with someone’s character:

He has many faults, but laziness isn’t one of them.

(Definition of “fault” from the Webster's Essential Mini Dictionary © Cambridge University Press)