There are multiple definitions - click on the translation that matches your context.

受承保的

形容词

full

underwritten

adjective

Definitions of underwritten

if a share issue is underwritten then an investor has agreed to buy any unsold shares

The issue is 100% underwritten.

if an insurance policy is underwritten then a person, group or institution has agreed to pay the insured party in case of damage or loss

The policy was underwritten by the National Life Insurance Company.