The phrase "fizzling out" refers to something gradually losing its intensity, energy, or relevance until it eventually fades into nothingness. Its antonyms are words and phrases that describe the opposite. Some of the most common antonyms for fizzle out are prospering, succeeding, thriving, flourishing, thriving, blossoming, blooming, boomed, and exploded onto the scene. If something is booming or thriving, it is experiencing a substantial increase in popularity, success, or growth. Blooming and blossoming suggest that something is growing and developing fruitfully, while exploding onto the scene refers to something or someone making a stunning and remarkable entrance onto the public stage.