Final answer:
An insurer will pay for damage to a neighbor's window under the liability coverage of a homeowner policy, which applies when the insured is legally responsible for unintentional property damage.
Step-by-step explanation:
The policy provision under which an insurer will pay for damage to a neighbor's window caused by an insured under a homeowner policy is typically the liability coverage section. Liability insurance is designed to cover unintentional damage to others' property or persons for which the insured is legally responsible.
In this case, if the insured's actions led to the window being broken, their homeowner's policy could cover the cost of repairing the neighbor's window. It's important to note that any deductibles or coinsurance terms in the policy would affect how much the policyholder is required to pay out-of-pocket before the insurance takes effect.