deceive, fool
Vous pensez que vous etes en train de me duper ?
Do you think you're trying to trick me?
— Chicago (2002)
Vous croyiez vraiment pouvoir me duper ?
Did you really think you could fool me?
— Insaisissables 2 (2016)
Impossible de nous duper !
You can't fool us!
— Les Fraises sauvages (1957)
Tu veux me duper ?
Do you want to fool me?
— Même la pluie (2011)
C'est mal de duper les gens comme ça.
It's wrong to deceive people like that.
Tu croyais me duper ?
You thought you could fool me?
— Mademoiselle (2016)