B2 有过错；有责任
to have done something wrong
Her doctor was at fault for/in not sending her straight to a specialist. 她的医生没有把她直接送到专科医生那里去治疗，在这一点上是有责任的。
There was a collision between the two vehicles, but it wasn't clear who was at fault.
Hundreds of customers were sent the wrong bills and it turned out that the new billing system was at fault.
My mother had clearly suffered, but we didn't have enough proof that the nursing home was at fault.
I don't think the school is at fault for anything. They did everything they could to keep the children safe.
See also: fault noun (MISTAKE)