at fault

Idioms  

1. Responsible for a mistake, trouble, or failure; deserving blame. For example, At least three cars were involved in the accident, so it was hard to determine which driver was at fault, or He kept missing the target and wondered if the sight on his new rifle was at fault. In Britain this usage was formerly considered incorrect but is now acceptable; in America it has been widespread since the mid-1800s. Also see in the wrong.

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Example Sentences

Defence barristers previously told the trial there was no doubt Motin was at fault for the collision, but claimed his actions did not amount to gross negligence manslaughter.

From BBC

Defence barristers previously told the trial there was "no doubt" Motin was at fault for the collision, but claimed his actions did not amount to gross negligence manslaughter.

From BBC

“It points to a process goal—reduce conflict, restore order, keep people safe—rather than a contested diagnosis of responsibility—who is at fault, which agency acted improperly, whether an action was lawful,” Santoro said.

From The Wall Street Journal

Only when Noem was questioned by a conservative reporter on Fox News about the circumstances of Pretti’s death did she suggest error may have been at fault.

From Los Angeles Times

The Spain international, 28, was arguably at fault for Arsenal's first two goals at Stamford Bridge, with Rosenior revealing his squad had also been hit by injury and illness.

From BBC