1. to make safe (as from risks or against overthrow) : insure
2. to give confidence to
3. to make sure or certain : convince
4. to inform positively
5. to make certain the coming or attainment of : guarantee
2 : and hereby we know that we are of the truth, and shall assure our hearts — 1 John 3:19
3 : He glanced back to assure himself that no onw was following.
4 : I assure you that we can do it.
5 : The man worked hard to assure accuracy.