Do or die is a popular phrase used to describe a situation that is of critical importance and must be handled with extreme urgency or determination. There are several synonyms that can be used instead of do or die, such as all or nothing, sink or swim, make or break, succeed or perish, win or lose, and fight or fail. These phrases all convey a sense of high stakes and the need for decisive action. They are often used in sports, business, and personal situations where success or failure hinges on a single action or decision. Whatever synonym is used, the message is clear: this is a time for action and results, not hesitation or indecision.