would tell him or her
Eso es lo que yo le diría a ella.
That’s what I would tell her.
Y quién sabe qué le diría a tu madre.
And who knows what he would say to your mother.
— Los chicos del coro (2004)
Él me prometió que no le diría a nadie.
He promised me he wouldn't tell anyone.
Ella dijo que le diría a los periódicos.
She said she would tell the newspapers.
— Pixote: A Lei do Mais Fraco (1980)