heyday

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heyday

An earlier time period in which something was very popular. For example, "the CP/M operating system had its heyday in the 1980s." Pronounced "hay-day."
References in classic literature ?
"Heyday!" cried D'Artagnan, drawing his sword and taking refuge behind his horse; "are you not mistaken?
Rushworth, but it was Julia, who, hot and out of breath, and with a look of disappointment, cried out on seeing her, "Heyday! Where are the others?
They were mostly young men, in the heyday of life; and having got into fine latitudes, upon smooth seas, with a well-stored ship under them, and a fair wind in the shoulder of the sail, they seemed to have got into a holiday world, and were disposed to enjoy it.
"Heyday!" quoth he, "yon is a gaily feathered bird, I take my vow."
On the following evening, at the usual hour, Van Baerle heard some one scratch at the grated little window, just as Rosa had been in the habit of doing in the heyday of their friendship.