This is the 144th most frequent French word.
doivent
"Doivent" means "must" or "have to" (third person plural of "devoir").
obligation
Les étudiants doivent terminer leurs devoirs avant demain.
The students must finish their homework before tomorrow.
expectation
Ces fleurs doivent pousser rapidement sous cette lumière.
These flowers should grow quickly under this light.
probability