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la incumbencia

concern, business

i n k u m ˈb e n θ j a
incumb concern; pertain + encia state, quality, or act of
noun · feminine Rare #46,194
concern, business Often used in the phrase «ser de alguien» (to be someone’s concern); «No es de mi incumbencia» means “It’s none of my business.”
SP: Ese asunto no es de mi incumbencia.
EN: That matter is none of my business.

Lo que la señora Fiorini haga no es de mi incumbencia.

What Mrs. Fiorini does is none of my business.

— Summertime (1955)

No es que sea de mi incumbencia.

Not that it's any of my business.

Nada de tu incumbencia.

None of your business.

— Anora (2024)

No es de nuestra incumbencia.

It is none of our business.

— Moonrise Kingdom: Amor Infantil (2012)

No creo que eso sea de tu incumbencia.

I don't think that's any of your business.

— Pasajero (2025)

No es de su incumbencia.

It's none of your business.