a namorada do

the girlfriend of

→ a
phrase Rare #26,435
the girlfriend of A namorada means “the girlfriend,” and do is the contraction of de + o (“of the”). This phrase is normally followed by a masculine noun or a man's name, such as a namorada do Tom (“Tom's girlfriend”).
PO: Ela é a namorada do meu irmão.
EN: She is my brother's girlfriend.

Aquela é a namorada do Tom?

Is that Tom's girlfriend?

Viu só a namorada do Peppe?

Did you see Peppe's girlfriend?

— Perfeitos Desconhecidos (2016)

Lisa é a namorada do Bryan.

Lisa is Bryan's girlfriend.

Você já conheceu a namorada do Tom?

Have you met Tom's girlfriend yet?

Aquelas que a namorada do Yoon deixou pra trás.

Those that Yoon's girlfriend left behind.

— Parasita (2019)

A namorada do seu melhor amigo é tão grande quanto uma baleia.

Your best friend’s girlfriend is as big as a whale.

Charlotte, a namorada do seu ex, o Laurence.

Charlotte, her ex-boyfriend Laurence's girlfriend.

— Laurence Anyways (2012)

Você foi a namorada do Tom quando você estava no ensino médio, não era?

You were Tom’s girlfriend when you were in high school, weren’t you?

Mary era a namorada do Tom naquela época.

Mary was Tom's girlfriend at the time.

Todos sabem que eu sou a namorada do Tom.

Everyone knows that I’m Tom’s girlfriend.