in (one's) heyday

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.
See also:
  • (one's) (true) stripes
  • (one's) true color(s)
  • (one's) true colours
  • (Someone or something) called, they want their (something) back!
  • lose (one's) spirit
  • bring (someone or something) alive
  • bring something alive
  • put lead in (one's) pencil
  • put lead in one's pencil
  • put lead in your pencil