second self
noun
one who associates so closely with a given person as to assume that person's mode of behavior, personality, beliefs, etc.
Origin of second self
First recorded in 1580–90
Words nearby second self
second reader,
second reading,
second reich,
second republic,
second row,
second self,
second service,
second sex,
second sheet,
second sight,
second story
Example sentences from the Web for second self
Was it his counterpart, or second-self, that made him feel that evening as though he had never known himself?
Dawn |Mrs. Harriet A. Adams