you miss; you are missing (from something)
You lack manners.
Je ne voulais pas que tu manques ton car.
I didn’t want you to miss your coach.
Tu manques de mélodie, mais ma fille t'apprendra.
You lack melody, but my daughter will teach you.
— Mon cœur est déjà pris (1999)
Viens au casino si tu manques de fonds.
Come to the casino if you’re short on funds.
— Les Bonnes étoiles (2022)
You lack practical sense.