oh dark thirty

Main Entry:  oh dark thirty
Part of Speech:  n
Definition:  a very early morning hour, implying an unpleasant time to be awake
Example:  I get up at oh dark thirty to have alone time before everyone else gets up.
Etymology:  fr military time, in which hours before 10:00 am are read as "oh", as in oh five-thirty for 5:30 am
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