The term "fizzled out" is often used to describe a lack of success or energy. However, there are many antonyms which can be used to describe the opposite of this phrase. These include "flourished," "thrived," "boomed," "blossomed," "succeeded," "prospered," and "flourished." Each of these words suggests growth, strength, and success which is the complete opposite of fizzling out. When we say something has fizzled out, it often implies that it was too weak or unimportant to continue. However, using these antonyms can help us describe moments of successful growth, progress, and prosperity.