acts, works, is about, concerns
Je crois que Tom agit de manière un peu suspecte.
I think Tom is acting a little suspiciously.
Il ne s’agit plus d’une audience de confirmation des charges.
It is no longer a hearing for the confirmation of charges.
— Oppenheimer (2023)
L'acide agit sur les choses qui contiennent du métal.
Acid reacts with things that contain metal.