なりすます

godan verb (-su), intransitive verb

impersonate; pose as; disguise oneself as

Used when someone deliberately pretends to be another person or a specific role, often with intent to deceive. Can imply successful deception.

• 彼かれは警けい察さつ官かんになりすまして、家いえに入はいった。

  He posed as a police officer and entered the house.

• ネット上じょうで有ゆう名めい人じんになりすます人ひとがいる。

  There are people who impersonate celebrities online.

godan verb (-su), intransitive verb

completely become; fully turn into

Describes a thorough transformation into a character or state, often in acting or metaphorical contexts. Less common than sense 1.

• 彼かれは役やくになりすまして、素すの自じ分ぶんを忘わすれた。

  He completely became the role and forgot his true self.