A more thorough explanation:

A common-disaster clause is a provision in a legal document, such as an insurance policy or a will, that addresses the possibility of the transferor and transferee dying in the same event or disaster.

For example, if a husband and wife have a joint will and they both die in a car accident, the common-disaster clause would determine how their assets are distributed. Without this clause, it would be unclear who should receive the assets if both parties die simultaneously.

The common-disaster clause is important because it ensures that the transfer of assets is handled fairly and according to the wishes of the transferor. It also helps to avoid confusion and disputes among beneficiaries.