人ひと違ちがえ

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、人ひと違ちがえをしました。

  Sorry, I mistook you for someone else.

• 彼かれはすっかり人ひと違ちがえするほど変かわってしまった。

  He has changed so much that he is barely recognizable.