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1. To become less effervescent or bubbly. This soda has fizzled out. I hate flat soda.
2. To fail or weaken, often slowly over time. No, I don't have a back-up plan—I didn't expect this idea to fizzle out so fast. Unfortunately, enthusiasm for this project has fizzled out after all of the delays.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. Lit. [for a liquid] to lose its effervescence. This seltzer has fizzled out. I need a fresh glass of it.
2. Fig. [for an item in a fireworks display] to fail to operate properly, often producing only a hiss. That last rocket fizzled out. Set off another one. A lot of the fireworks fizzled out because it was raining.
3. Fig. to fade or become ineffectual gradually. The party began to fizzle out about midnight. The last clerk I hired fizzled out after the first week.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Fail, end weakly, especially after a hopeful beginning. For example, The enthusiasm for reform has fizzled out in this state. The word fizzle dates from the early 1500s and meant "to break wind without making noise." Later it was applied to hissing noises, such as those made by wet fireworks, and then to any endeavor that ends in disappointment. [Colloquial; mid-1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To come gradually to an end by growing fainter, weaker, less active, or less frequent: I lit the fuse of the firecracker, but it fizzled out. The party finally fizzled out after midnight.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.