in the wrong
in the wrong {adj. phr.}
With moral or legal right or truth against you; against justice, truth, or fact; wrong.
In attacking a smaller boy, Jack was plainly in the wrong.
Mary was in the wrong to drink from a finger bowl.
Since he had put pennies behind the fuses, Bill was in the wrong when fire broke out.
Compare: OUT OF THE WAY.
Contrast: IN THE RIGHT.
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Source: A Dictionary of American Idioms