A sublimit is a deviating upper limit within the insurance contract of a → Sum insured.

For example, in personal liability insurance, the → Sum insured for property damage up to 10 million euros, but the co-insured rental property damage is only insured up to a sub-limit of 100,000 euros.

Source reference: See VDT publication "VDT article series part 5 l Glossary" and the source indicated there.