birthday-suit

birthday suit

noun
bare skin; nakedness: They were sunbathing in their birthday suits.

Origin:
1745–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
birthday suit
 
n
informal, jocular a state of total nakedness, as at birth

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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Etymonline
Word Origin & History

birthday suit
first attested 1730s, but probably much older. The notion is the suit of clothes one was born in, i.e., no clothes at all. Cf. M.E. mother naked "naked as the day one was born;" M.Du. moeder naect, Ger. mutternackt.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

birthday suit definition


To be “in one's birthday suit” is to be completely naked (as people are at birth).

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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Synonyms
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