second self

noun

1. one who associates so closely with a given person as to assume that person's mode of behavior, personality, beliefs, etc.

Word History and Origins

Origin of second self¹

First recorded in 1580–90

Example Sentences

Already the Duke inspired him with a sort of second-self-consciousness.

From Project Gutenberg

Was it his counterpart, or second-self, that made him feel that evening as though he had never known himself?

From Project Gutenberg

An automatic second-self, summoned by the emergency, answered for him.

From Project Gutenberg