get someone wrong
Misunderstand someone, as in I think you got him wrong. This expression is often put as Don't get me wrong, used to clarify one's feelings, views, or the like, as in Don't get me wrongI'm happy about the outcome. [Colloquial; c. 1900] Also see make no mistake.
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.