noun
heyday
HAY-day
noun
1
The period when someone or something was most successful, popular, or powerful.
"In its heyday, the factory employed thousands of local workers."
"The band was massive in the 1980s, but their heyday didn't last."
How to Use Heyday
Learner’s notesIn plain EnglishSomeone's "heyday" is their peak — the high point of their fame, success, or power.
Common pairings
in its heyday
the heyday of
past its heyday
Word Forms
heydays plural
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In its _____, the factory employed thousands of local workers.
Etymology
From an older exclamation "heyda" (a cry of high spirits), later respelled "heyday" by association with "day," giving it the sense of a golden period of time.