Definition of unbirthday in English:

unbirthday

Syllabification: un·birth·day
Pronunciation: /ˌənˈbərTHdā
 
/

noun

humorous
Any day except one’s birthday: [as modifier]: an unbirthday present
More example sentences
  • And Mrs Du Faur may have been the first and last person to celebrate ‘unbirthdays’.
  • They can draw money out of 401 plans and IRAs to celebrate their unbirthdays or prepare for their big 60th bashes.
  • Ahhh, but there are three hundred and sixty four unbirthdays!

Origin

1871: coined by Lewis Carroll in Through the Looking Glass.

Definition of unbirthday in:

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