a thing of the past

thing of the past

1. Something that no longer exists. Those stores are a thing of the past—their parent company filed bankruptcy a few years ago.
2. By extension, something that is no longer popular or commonplace. I think everyone is glad that leisure suits are a thing of the past. In today's society, it certainly seems like manners are becoming a thing of the past.
See also: of, past, thing
Farlex Dictionary of Idioms.

a thing of the ˈpast

something that no longer happens or exists: Everybody sends emails these days. Letter-writing has become a thing of the past.
See also: of, past, thing
Farlex Partner Idioms Dictionary
See also:
  • a crack at (someone or something)
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • all righty
  • a straw will show which way the wind blows
  • all right
  • (you) wanna make something of it?
  • (something) is the new (something)
  • all for the best
  • a slew of (something)
References in periodicals archive
Old anxiety-producing (to say the least) patterns are a thing of the past, and you're about to settle into a new-and-improved groove.
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With the Competition Act we hope such unethical practices will become a thing of the past.
Good to know where the bad guys hang out