A done deal Definition 1 of 2Pro Tip 1/3Irreversible Action Indicates that an action has been taken and cannot be undone or revised. The tickets are non-refundable; buying them was a done deal. Pro Tip 2/3Agreement Finality Used when an agreement has been reached and all parties consider it final and binding. They shook hands, and the partnership became a done deal. Pro Tip 3/3Colloquial Usage Commonly used in everyday conversation rather than formal or legal discussions. I heard you got the promotion, so it's a done deal now, right?