be a dead ringer for

US /bi ə dɛd ˈrɪŋər fɔr/
UK /bi ə dɛd ˈrɪŋər fɔr/
"be a dead ringer for" picture
1.

そっくりだ, 瓜二つだ

to look exactly like someone else

:
She could be a dead ringer for her grandmother when she was young.
彼女は若い頃の祖母にそっくりだ
That actor is a dead ringer for my old high school teacher.
あの俳優は私の高校時代の先生にそっくりだ