Oh-dark-thirty meaning

Alternative spelling of oh dark thirty.
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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.

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Origin of oh-dark-thirty

  • From military time, 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.

    From Wiktionary