su secreto

his/her secret

→ su
phrase Uncommon #18,245
his/her secret “Su” can also mean “your” (formal), “its,” or “their,” depending on context.
SP: No le cuentes a nadie su secreto.
EN: Don’t tell anyone their secret.

Mi padre, esa bestia vieja, no me dijo su secreto.

My father, that old beast, didn't tell me his secret.

— Andrei Rublev (1966)

Yo sé su secreto.

I know their secret.

Estábamos todos atentos cuando empezó a contarnos su secreto.

We were all listening intently when he started telling us his secret.

Tom le susurró su secreto más oscuro a Mary.

Tom whispered his darkest secret to Mary.

Ella me dijo su secreto.

She told me her secret.

Su secreto está a salvo conmigo.

Your secret is safe with me.

— El sonido de la muerte (2026)

Tom no le dijo su secreto a Mary.

Tom didn't tell Mary his secret.

Ella no me dijo su secreto.

She didn't tell me her secret.

Tu nombre real y su secreto.

Your real name and its secret.

— Casi famosos (2000)

Sólo yo he comprendido su secreto.

Only I have understood his secret.

Su secreto será pronto revelado.

Their secret will soon be revealed.