An optional redemption feature on a debt instrument allowing the beneficiary of the estate of the deceased to put (sell) the bond (back to the issuer) in the event of the beneficiary's death or legal incapacitation. Also known as a "survivor's option".
The death put may be redeemed at par value, and then all proceeds are deposited into the estate. Should interest rates increase substantially, the put may earn a large profit for beneficiaries of the estate.