culpa suya

his fault / her fault

→ culpa
phrase Rare #30,935
his fault / her fault Can also mean 'their fault' or 'your fault' depending on context. Often used with someone being blamed for something.
SP: La discusión fue culpa suya.
EN: The argument was his fault.

Era culpa suya.

It was his fault.

No ha sido culpa suya.

It wasn't his fault.

— La strada (1954)

Fue culpa suya.

It was his fault.

No fue culpa suya.

It wasn't his fault.

— El club de los poetas muertos (1989)

No es culpa suya.

It's not your fault.

— Amelie (2001)

El accidente es culpa suya.

The accident is your fault.

En el fondo es culpa suya.

Deep down, it's their fault.

— Fellini, ocho y medio (1963)

Fue todo culpa suya.

It was all his fault.

Tom no cree que fuera culpa suya.

Tom doesn't think it was his fault.