in (one's) heyday(redirected from in our hay days)
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in (one's) heyday
In, at, or during the period of one's greatest success, power, vigor, etc. In my heyday as a stock broker, I was making millions of dollars each year, but when the economy crashed, I lost nearly everything.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.