a dead ringer for somebody

dead ringer

A person or thing that bears a strong resemblance to someone or something else. Susie was such a dead ringer for Kate Winslet that sometimes people would ask her for her autograph.
See also: dead, ringer

a dead ˈringer for somebody

(informal) a person who looks extremely like somebody else: She’s a dead ringer for her mother.A ringer was a person or thing that pretended to be another person or thing. In horse racing for example, a ringer was a horse that was substituted for another in order to cheat in a race.
See also: dead, ringer, somebody