at fault
出毛病, 有责任, 失去嗅迹而不能继续追踪
例句与用法：
Deserving censure; at fault.
谴责应受谴责的; 有过错的
At this point your logic is at fault.
在这一点上你的推理是错误的。
It's management that's at fault rather than the work-force.
错在资方而不在劳方。
My memory was at fault.
我记错了。
出毛病
My memory is at fault.
我想不起来了。