English
Category:English idioms
Etymology
From military time, in which hours before 10:00 am are prefixed with a zero, read as "oh", as in oh five-thirty for 5:30 am.

Noun
oh dark thirty, oh-dark-thirty

1. Some unspecified hour in the early morning (implies an unpleasant time to be awake)

#:I had to get up at oh dark thirty to catch a plane.

Related terms
wee small hours
Zero Dark Thirty
crack of dawn

• 2007-03-15 09:54 - SemperBlotto - Reverted edits by [[Special:Contributions/139.168.188.89|139.168.188.89]] ([[User_talk:139.168.188.89|Talk]]); changed back to last version by [[User:Uncle G|Uncle G]]

Full Revision History