that, that thing
Eres aquello que haces, no aquello que dices que harás.
You are what you do, not what you say you’ll do.
¡En mi casa hago aquello que me parece y me place!
In my own home, I do whatever I want!
— Divorzio all'italiana (1961)
No sé por qué estaba ocurriendo aquello.
I don't know why that was happening.
David había adivinado correctamente hacia dónde iba todo aquello.
David had correctly guessed where it was all headed.