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unbirthday

/ (ˌʌnˈbɜːθdeɪ) /
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noun
British jocular
  1. any day other than one's birthday
  2. (as modifier)an unbirthday present
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Word Origin for unbirthday

C19: coined by Lewis Carroll in Through the Looking-Glass
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
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