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old hat

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adjective
  1. old-fashioned; dated.
  2. trite from having long been used or known.
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Origin of old hat

First recorded in 1745–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for old hat

old hat

adjective
  1. (postpositive) old-fashioned or trite
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for old hat

adj.

"out of date," first recorded 1911. As a noun phrase, however, it had different sense previously. The "Classical Dictionary of the Vulgar Tongue" (1796) defines it as, "a woman's privities, because frequently felt."

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Online Etymology Dictionary, © 2010 Douglas Harper

old hat in Culture

old hat

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

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.