v (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.
v (intransitive) To deal in such contracts; subscribe to a policy of insurance
v (chiefly|US)(alternative spelling of|ensure|nodot=1): (transitive) To make sure or certain of; guarantee.
v (context|perhaps|_|nonstandard)(alternative form of|assure|nodot=1): (transitive) To give confidence in the trustworthiness of.