old hat
[adjective]
Synonyms: old-fashioned, antiquated, antique, archaic, dated, démodé, oldfangled, old-time, out-of-date, vintage, trite, cliché, clichéd, hackneyed, shopworn, stale, threadbare, timeworn, tired, well-worn

[TahlilGaran] English Synonym Dictionary ▲

ˌold ˈhat adjective [not before noun]
if something is old hat, a lot of people have said or done the same thing before and it is therefore not new or interesting:
Most of this is probably old hat to you, isn’t it?

[TahlilGaran] Dictionary of Contemporary English ▲

old hat
if something is old hat, it is not new or modern any more.
A 24-hour banking service may seem old hat in the United States, but it's still innovative in Europe.

[TahlilGaran] English Idioms Dictionary ▲

old hat
to be not new or different, to be old-fashioned
We have been using the new computer program for many months. It is old hat now.

My job has become old hat and I am becoming tired of it.

[TahlilGaran] English Idioms Dictionary ▲

old hat
adj., informal Old-fashioned; not new or different.
By now, putting satellites in orbit is old hat to space scientists.
Andrea thought her mother's ideas about dating were old hat.

[TahlilGaran] English Idioms Dictionary ▲