There are several synonyms for the popular phrase "a done deal." Among the top choices include "a sealed deal," "a final agreement," "concluded transaction," "settled matter," "closed deal," and "already decided." Other options include "a foregone conclusion," "a sure thing," "an accomplished fact," "a closed book," and "a dead cert." These synonyms are commonly used to describe a situation where an agreement has been made, a decision has been reached, or a deal has been closed, with little or no possibility of being overturned or changed. Regardless of the choice of words, they all point to the same idea of a successful outcome with no chance of reversal.