An insure usually means to buy protection for something valuable that might get damaged or lost. You insure your house against fire, your car against theft.
When people talk about insuring things, they often mean buying a policy from an insurance company. This way, if something bad happens to what you own, the company will help pay for repairs or replacement. For example, someone might say "I'll just go online and insure my new laptop" which means they're going to buy protection against accidents that could damage it.
To make a pledge to (someone); to promise, guarantee (someone of something); to assure.
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.
Example: I'm not insured against burglary.
