cosa suya

his doing

→ cosa
phrase Rare #42,002
his doing Used to say that something was done by him, or that it is his responsibility / concern.
SP: Si pasó algo, seguramente fue cosa suya.
EN: If something happened, it was probably his doing.

Señor Shukla, ¿ha sido cosa suya?

Mr. Shukla, was this your doing?

— Dil se.. (1998)

Eso es cosa suya.

That's up to you.

— La linterna roja (1991)

Tom decidió que no era cosa suya decirle a Mary lo que John había hecho.

Tom decided it wasn’t his place to tell Mary what John had done.

Es cosa suya.

It's up to you.

Ha sido cosa suya.

It was his doing.

— Malèna (2000)