su llave

his/her key

→ su
phrase Uncommon #19,790
his/her key Su can also mean “your” (formal) or “their”; the owner is usually clear from context.
SP: Olvidó su llave en casa.
EN: He forgot his key at home.

Tom no pudo encontrar su llave por ningún lado.

Tom couldn't find his key anywhere.

Tiene el Sr. Harry Potter su llave?

Does Mr. Harry Potter have his key?

— Harry Potter y la piedra filosofal (2001)

Necesitamos su llave.

We need your key.

Cada una tiene su llave.

Each one has its key.

Tom parece haber perdido su llave.

Tom seems to have lost his key.

Tom me dio su llave.

Tom gave me his key.

Tom tenía miedo de haber perdido su llave.

Tom was afraid he had lost his key.

Encontró su llave y abrió la puerta.

He found his key and opened the door.