assure
🇺🇸
/əˈʃʊr/
🇬🇧
/əˈʃʊə(r)/
to tell someone something is true or will happen, especially when they are unsure
I assure you that the package will arrive on time.
to make yourself sure about something
She wanted to assure herself that the door was locked.
to make something sure to happen
Winning this game will assure our team a spot in the playoffs.
to insure something, especially against someone's death
The policy will assure a payment if the insured person dies.