verb

• (transitive) 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.
• (intransitive) To deal in such contracts; subscribe to a policy of insurance
• (chiefly US, transitive, dated) Alternative spelling of ensure; to make sure or certain of; guarantee. [(transitive) To make a pledge to (someone); to promise, guarantee (someone of something); to assure.]