Sunday's term was coinsurance, which is defined as:
n. an insurance policy in which the insurance company insures only a partial value of the property owned by the insured owner. Essentially the owner and the insurance company share the risk.
No one guessed.
Today's term, in keeping with the insurance theme, is:
Supplementary uninsured/underinsured motorists coverage aka SUM.
I know that at least one of my regular readers knows this one! As always, no dictionaries, please.