at fault

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.

Example Sentences

“We believe that the evidence is clear that Edison is at fault,” Essayli said.

From Los Angeles Times

In 2023, a California state jury found Tesla was not at fault in a case in which it was alleged that Autopilot had led to a death.

From BBC

As failings go, this was a seismic one and in analysing who is at fault, there is a world of criticism for everybody.

From BBC

Defensively they are proving extremely vulnerable from set-pieces, with three of the five goals they conceded against Chelsea coming from them - and Hermansen at fault for two as he struggled to deal with corners.

From BBC

Not only is Oregon’s map seen as at fault for higher insurance premiums, one conservative talk radio host calls it an attempt to “depopulate rural areas.”

From Salon