com ! I would understand a 'deal breaker' as something or someone that causes the deal to be cancelled or terminated. In other words breaking the deal means that the agreement becomes 'null and void' eg is no longer valid and binding to the parties.
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JjfA "deal breaker" is "that which breaks (terminates, cancels) the deal." It can be a position that is unacceptable to the other party ("we will never allow you to have nuclear capacity" or "we will continue acquiring nuclear materials") or an action that violates the conditions of the deal (such as continuing nuclear research after promising to stop it).Thx