be a dead ringer for
US /bi ə dɛd ˈrɪŋər fɔr/
UK /bi ə dɛd ˈrɪŋər fɔr/

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。