en mettre sa main à couper*

* to put one's hand out to be cut

French French speaking countries

Expression USED On Rare Occasion BY Some People

Te be extremely sure of something. So sure that you would let your hand to be cut if you're wrong.

"Mon rouge à lèvre a encore disparu! J'en mets ma main à couper que c'est ma soeur qui l'a pris!'

"My lipstick disappeared again! I put my hand out to cut that my sister took it!"

Confirmed by 6 people