Oh dark thirty

From Fresh Dictionary

Contents 1 English 1.1 Etymology 1.2 Noun 1.3 Related terms

English

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.

Noun

oh dark thirty, 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.

Related terms

wee small hours Zero Dark Thirty crack of dawn