insure

To provide for compensation if some specified risk occurs. Often agreed by policy (contract) to offer financial compensation in case of an accident, theft or other undesirable event.

I'm not insured against burglary.

To deal in such contracts; subscribe to a policy of insurance

Alternative spelling of ensure; to make sure or certain of; guarantee.

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

"I have a friend at court," whispered she to her companion: "last night I singled out one of Sir Robert's secretaries, and a few smiles made him my devoted chevalier, and he promised to insure an interview."