sa maîtresse

his/her mistress

→ son
phrase Rare #30,627
his/her mistress Depending on context, maîtresse can also mean “female teacher.” Sa means “his” or “her”; it agrees with the feminine noun maîtresse.
FR: Il est allé au cinéma avec sa maîtresse.
EN: He went to the cinema with his mistress.

Et il aurait éventré sa maîtresse et arraché ses yeux ?

And he allegedly disemboweled his mistress and gouged out her eyes?

— The Man From Nowhere (2010)

Il dépense sa fortune pour sa maîtresse et son fils.

He spends his fortune on his mistress and his son.

— Gangs of Wasseypur : 1ère partie (2012)

C'était sa maîtresse et elle vous a aidée.

She was his mistress, and she helped you.

— Les Diaboliques (1955)

Je suis le bâtard d'un aristocrate français et de sa maîtresse !

I'm the illegitimate son of a French aristocrat and his mistress!

— The Count of Monte Cristo (2024)

Mon neveu, Nicolas Rouillard, m'a dit que sa maîtresse s'appelait Adèle.

My nephew, Nicolas Rouillard, told me that his teacher's name was Adèle.

— La Vie d'Adèle - Chapitres 1 et 2 (2013)

Il faudra donc que je devienne sa maîtresse.

So I will have to become his mistress.

— Lust, Caution (2007)

Elle aurait tué son mari volage et sa maîtresse avant de les dévorer.

She allegedly killed her philandering husband and his mistress before devouring them.

— Lady Vengeance (2005)

J'ai retrouvé la trace de Victoria, sa maîtresse.

I found a lead on Victoria, his mistress.

— The Count of Monte Cristo (2024)

Il est allé avec sa maîtresse à Acapulco.

He went to Acapulco with his mistress.

— Roma (2018)

C'était sa maîtresse.

She was his mistress.

— Les Diaboliques (1955)

À sa maîtresse ?

To his teacher?

— Pierrot le Fou (1965)

Benjamin Guggenheim et sa maîtresse, Mme Aubert.

Benjamin Guggenheim and his mistress, Mme Aubert.

— Titanic (1997)