Or bust is an idiomatic expression typically used to convey the idea of doing something without considering any alternative options, implying that failure or nothing less than success is acceptable. Although this phrase has its own distinct charm, there are various synonyms that can be utilized to add variety and originality to one's communication. Some alternatives include "succeed or perish", "achieve or collapse", "triumph or flounder", "thrive or fall", "prevail or sink", and "conquer or crumble". These phrases maintain the same notion of a determined outcome, emphasizing the high stakes involved and the unwavering commitment required for eventual success.