in camera sua

in his/her room

→ in
phrase Uncommon #21,449
in his/her room “Camera” means “room” here, not “camera”; “sua” can mean “his” or “her,” depending on context.
IT: Mia sorella è in camera sua.
EN: My sister is in her room.

Passa tutto il tempo in camera sua.

He spends all his time in his room.

— Love Actually - L'amore davvero (2003)

Hai guardato in camera sua?

Did you look in his room?

— Effetto notte (1973)

In camera sua.

In his room.

— Perfetti sconosciuti (2016)

Bob ha molti libri in camera sua.

Bob has a lot of books in his room.

Shoya e in camera sua.

Shoya is in his room.

— La Forma della Voce (2016)

Non è in camera sua?

Isn't he in his room?

— Effetto notte (1973)

La bambina è in camera sua.

The little girl is in her room.

— TÁR (2022)

Io dormo col bambino e tu stai in camera sua.

I’ll sleep with the baby, and you’ll stay in his room.

— Il profeta (2009)

Sta sempre in camera sua.

He/She is always in their room.

— Love Actually - L'amore davvero (2003)

Sta giocando in camera sua.

He's playing in his room.

— Train to Busan (2016)

Sartorius è in camera sua, Ghibarian è morto.

Sartorius is in his room, Ghibarian is dead.

— Solaris (1972)

Giusto, andiamo in camera sua.

Right, let’s go to his room.

— The Monster (1994)

Nonna, torni di sopra in camera sua.

Grandma, go back upstairs to your room.

— Delicatessen (1991)

Bob ha un sacco di libri in camera sua.

Bob has a lot of books in his room.