noun
mistaken identity; person so changed they are hard to recognize
Refers to confusing one person for another, or to someone who has changed so much that they are barely recognizable. Often used in set phrases like 人違いをする.
すみません、人違えをしました。
Sorry, I mistook you for someone else.
彼はすっかり人違えするほど変わってしまった。
He has changed so much that he is barely recognizable.