oh dark thirty

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English[edit]

Alternative forms[edit]

Etymology[edit]

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.

Noun[edit]

oh dark thirty

  1. 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.

Coordinate terms[edit]