This is the 10230th most frequent French word.
incombe
"Incumbe" means "it is incumbent upon" or "it falls to (someone)."
In this sentence, 'incombe' is used to indicate a duty or obligation assigned to the subject (everyone) to adhere to the rules.
Il incombe à chacun de respecter les règles.
It is incumbent upon everyone to respect the rules.
Here, 'incombe' specifies a particular obligation or responsibility of the teacher in the context of assisting students.
Il incombe à l'enseignant d'aider ses élèves à apprendre.
It is the teacher's responsibility to help their students learn.
In this instance, 'incombe' stresses the responsibility or duty of the citizens towards environmental conservation.