RESPONSIBLE FOR MISTAKE 对错误负责, if something bad that has happened is your fault, you should be blamed for it, because you made a mistake or failed to do something

责任，过错:

I'm really sorry – it's all my fault.

我真的很抱歉 — 都是我的错。

It's your fault we're late.

我们迟到都是你的责任。

I didn't sleep well that night, but it was my own fault .

那天晚上我没有睡好，但这都是我自己不好。

It's my fault for not making your new job clearer.

没把你的新工作解释清楚是我的责任。

at fault, if someone is at fault, they are responsible for something bad that has happened

有过错; 应当负责:

The police said that the other driver was at fault.

警方说是另一位司机的责任 。

Some people claim that it is the UN that is at fault.

有些人说联合国负有责任。

STH WRONG WITH STH 某事物出毛病

SB'S CHARACTER 某人的性格, a bad or weak part of someone's character

〔性格的〕缺点，弱点:

His worst fault is his arrogance.

他最大的缺点是傲慢。

I may have my faults , but ingratitude is not one of them.

我可能有我的缺点，但是决不会忘恩负义。

For all his faults (=in spite of his faults) he was a good father.

尽管他有缺点，但他还是个好父亲。

through no fault of her / my etc own, used to say that something bad that happened to someone was not caused by them

不是由于她/我等自己的错:

Through no fault of our own we are currently two players short.

我们眼下缺两名队员并非我们的错。

CRACK 裂缝, a large crack in the rocks that form the Earth's surface

〔地表岩石的〕断层:

the San Andreas fault

圣安德烈亚斯断层

generous / loyal / honest etc to a fault, extremely generous, kind etc

过分大方/忠诚/老实等:

Barry's kind, caring and generous to a fault.

巴里的友好、体贴和大方过了头。

TENNIS 网球, a mistake made when a player is SERVING the ball in tennis

发球失误

to criticize someone or something for a mistake

找…的缺点，挑剔，指责:

The judge cannot be faulted on his decision.

这位法官的判决无可指责。

You might not like O'Donnel's arrogance, but it's hard to fault what he does on the field.

你也许不喜欢奥唐奈的傲慢，但是他在球场上的表现无可挑剔。