This is the 3922nd most frequent French word.
assure
"Assure" in French means "ensure" or "guarantee."
Here, "m'assure" means "I make sure," which reflects the reflexive verb "s'assurer" used to express checking or verifying something oneself.
Je m'assure que tout est en ordre avant de partir.
I make sure everything is in order before leaving.
Here, "assure" as a third person singular conjugation of "assurer" means "ensures," used to guarantee or provide fulfillment of something.
Cette serrure assure une sécurité optimale.
This lock ensures optimal security.
Here, "m'assure" indicates that he is reassuring or promising to me that he will come tomorrow, illustrating assurance or guarantee.