la sua fiducia

his/her trust

→ il
phrase Rare #31,408
his/her trust The possessive sua can mean “his,” “her,” or formal “your,” depending on context. Fiducia is feminine, so it takes la sua.
IT: Dobbiamo riconquistare la sua fiducia.
EN: We need to regain his trust.

No, la sua fiducia.

No, his trust.

— Il conformista (1971)

Ti devi guadagnare la sua fiducia.

You have to earn his trust.

Vi dovete guadagnare la sua fiducia.

You have to earn his trust.

La sua fiducia cominciò a crescere.

His confidence began to grow.

Avresti dovuto lasciarlo fare e avresti ancora la sua fiducia.

You should have let him do it and you would still have his trust.

— Mission: Impossible - Rogue Nation (2015)

Hai tradito la sua fiducia.

You betrayed his trust.

— Lo Hobbit: La desolazione di Smaug (2013)