"Bomb out" is an informal term that refers to the occurrence of a failure or collapse. It is commonly used to describe something that didn't go according to plan or fell short of expectations. Some of the synonyms for "bomb out" are "fizzle out," "fall through," "come to naught," "falter," and "collapse." These terms can be used interchangeably with "bomb out" in various contexts, such as business, sports, and personal situations. Whether one's big plan fizzles out or a relationship falls through, it's important to keep in mind that it is natural to experience setbacks and failures, and learning from them can help us grow and succeed in the long run.