dead ringer for someone

dead ringer for (someone)

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

(dead) ringer (for someone)

n. someone who is an exact duplicate of someone else. (see also ringer.) You are sure a dead ringer for my brother. See also: dead, ringer, someone