mayfly

/ˈmeɪˌflaɪ/
noun
  1. A small insect with a very short adult lifespan, often living only for a day or two.
    • The mayfly lives most of its life as a nymph underwater.
    • Mayflies hatch in huge swarms near rivers in late spring.
    • We saw thousands of mayflies dancing over the lake at sunset.
  2. Something that is short-lived or fleeting.
    • That viral video was a mayfly — popular for a day and then forgotten.
    • Her fame turned out to be a mayfly, gone as quickly as it came.
    • Trends in fashion are often mayflies, here and gone in a season.
Synonyms
What does "mayfly" mean? | whatsthatwordmean | whatsthatwordmean