noun, noun which may take the genitive case particle 'no'
under-insurance
Insurance term: a situation where the insured amount is less than the actual value of the insured object, leaving the policyholder partially exposed.
火災保険が一部保険だったため、全額は補償されなかった。
Because the fire insurance was under-insurance, the full amount was not covered.
Compound of 一部 (いちぶ, 'a part') and 保険 (ほけん, 'insurance').