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de costas

on one’s back

→ de
phrase Uncommon #13,309
on one’s back Also used to mean with one’s back turned or facing away, depending on context.
PO: Ele caiu de costas na cama.
EN: He fell onto the bed on his back.

Tom ficou de costas para o prédio.

Tom turned his back to the building.

Vire-se de costas.

Turn your back.

Está bem, deixe que ele nos escute, mas vamos virá-lo de costas.

Okay, let him listen to us, but let's turn him around.

— Ирония судьбы, или С легким паром! (1976)

Mas eu também ronco quando durmo de costas.

But I also snore when I sleep on my back.

— Moscou Não Acredita em Lágrimas (1980)

De costas, parece uma menina.

From behind, she looks like a little girl.

— O Ódio (1995)

Tom se deitou de costas.

Tom lay down on his back.

Tom e Mary dormem de costas.

Tom and Mary sleep back to back.

Tá vendo ele aqui de costas?

Do you see him here with his back turned?

— O Auto da Compadecida (2000)

Quando garoto eu costumava deitar de costas na grama e olhar as nuvens brancas.

When I was a boy, I used to lie on my back in the grass and look at the white clouds.

Não te disse para nunca te sentar de costas para a porta?

Didn't I tell you never to sit with your back to the door?

— Malcolm X (1992)

Ela virou-se de costas para Tom.

She turned her back to Tom.

De costas.

Back turned.

— Pillion (2025)

Quebrei o recorde da escola no nado de costas.

I broke the school record in the backstroke.

— Moonrise Kingdom (2012)

Eu troquei as taças quando te virou de costas.

I switched the glasses when he turned his back on you.

— A Princesa Prometida (1987)

Tom estava de costas para o prédio.

Tom had his back to the building.

Vira de costas.

Turn your back.

— O Espelho (1975)

Vire de costas.

Turn around.

— O Profeta (2009)

Está de costas.

His back is turned.

— Malcolm X (1992)

Ele estava deitado de costas?

Was he lying on his back?

E a próxima coisa que acontece estará de costas.

And the next thing that happens, you'll be facing away from me.

— Shrek (2001)

Ele sabe nadar de costas.

He knows how to swim on his back.

Vou virar de costas.

I'm going to turn my back.

— Tudo Sobre Minha Mãe (1999)

Ele se deitou de costas.

He lay down on his back.

Ela nada de costas melhor do que de frente.

She swims better with her back to the camera than with her front to the camera.

Vou ficar de costas enquanto você se veste.

I’ll turn around while you get dressed.

Não fique de costas para a porta.

Don't stand with your back to the door.

— Duna (2021)