to mold, to mildew
Mais là, il va moisir.
But as it is, it's going to rot.
— Taxi (1998)
Il va pas rester moisir ici.
He's not going to stay here rotting away.
— Harry Potter à l'école des sorciers (2001)
Si je suis pas tourneur, je dois moisir ?
If I'm not a lathe operator, am I supposed to just rot away?
— Le Voleur de bicyclette (1948)
Ils t'ont pas laissé moisir sur terre.
They didn’t leave you to rot on earth.
— Le Bateau (1981)