[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.