Definitions | oh dark thirty |
| noun , oh-dark-thirty
- 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.
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.
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