oh dark thirty
Meanings
noun
- Some unspecified hour in the early morning (implying an unpleasant time to be awake).
Pronunciation
Word forms
Etymology
From U.S. military terminology, in which hours before 10:00 am are prefixed with a zero, read as "oh", as in 0530, oh five-thirty, for 5:30 am.
Synonyms
Related words
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