invent
Tu inventes.
You're making it up.
Je suis sûr que tu inventes ces histoires à mesure, non ?
I'm sure you're making up these stories as you go along, right?
— Le Tao de Steve (2000)
On t'a raconté ces inepties ou tu les inventes ?
Did someone tell you this nonsense, or are you making it up?
— La Légende du pianiste sur l'océan (1998)
Mais qu'est-ce que tu inventes ?
What on earth are you making up?
— Les Diaboliques (1955)
Laura, tu inventes.
Laura, you're making it up.
— L'Orphelinat (2007)