The term 'hell or high water clause' comes from the expression “come hell or high water,” which means that an action must be done regardless of what happens. Why You May Need a Hell or High Water Clause
The clause is normally intended to reduce the possibility of the purchaser breaching the contract with the excuse that the contract became impossible to fulfill. Some of the difficulties that may be encountered include equipment failure, damage, loss, and even death of the purchaser.
A hell or high water clause in a contract is a provision that states that a purchaser must pay the stipulated payments at the agreed time regardless of any difficulties he may encounter.
