deliberate fault

But whether it had been a deliberate fault, an error in judgment, or a mad impulse-who was absolutely sure?

The basic idea was to introduce a few deliberate faults in the intermediate calculations, making it possible to deduce the last eight round keys.

All this, although through no deliberate fault of mine, lay at my door; but badly as I felt about it, fate had placed it beyond my power to help him.

In the Beast Boy mini-series, she sought revenge against Beast Boy for killing her mother, her insanity having twisted her mother's death as the deliberate fault of Doctor Caulder and Beast Boy when it was merely an accident.