411 REFERENCE · Wiktionary
0-dark-thirty
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
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en chiefly US _ military slang en oh dark thirty.
en 2002 Jonathan Shay Odysseus in America: Combat Trauma and the Trials of Homecoming In the very early morning--0-dark-30--the veterans have the Wall entirely to themselves, which is the main reason that we go at that hour.
en Times of day