old hat

old-fashioned; dated.
trite from having long been used or known.


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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
old hat
(postpositive) old-fashioned or trite

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

old hat
"out of date," first recorded 1911. As a noun phrase, however, it had a different sense in 18c. The "Classical Dictionary of the Vulgar Tongue" (1796) defines it as, "a woman's privities, because frequently felt."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

old hat definition

Obsolete, old-fashioned: “Get with it, Murray; your methods are strictly old hat.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
His eyes light up as he's describing something, even though to him it may be
  old hat.
Dealing with budget cuts, even steep ones, is old hat for professors and the
  unions that represent them.
His suggestion that our universe may be a simulation run on the computer of an
  alien civilization is also old hat.
The stuff they're accused of doing-the seeds of scandal-are old hat.
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