a hunch
It's just a hunch.
Je pense que les gens ont une intuition, à propos de ces choses.
I think people have an intuition about these things.
— Departures (2008)
C'est comme si tu avais eu une intuition.
It's as if you'd had a hunch.
— Perfetti sconosciuti (2016)
It was just a hunch.
I had a hunch.
C'est une intuition, mais je crois bien.
It’s an intuition, but I think so.
— Femmes au bord de la crise de nerfs (1988)
I have a hunch.