oh dark thirty
Proposed by a contributor, not yet supported by evidence.
Also seen as: 0-dark-thirty
Meaning · English
an extremely early hour of the morning
Literally: before the sun rises
Where it’s used:
Used
Widespread English
Examples
I have to wake up at oh dark thirty for my shift
AI-drafted example auto-approved by rule (illustrative, not a corpus attestation)
Sources & notes
Listed in Wiktionary’s “English idioms” category (retrieved 2026-07-29); definition pending editorial review. Definition drafted by AI (@cf/meta/llama-3.3-70b-instruct-fp8-fast) and auto-approved by rule on 2026-07-31; pending editor spot-check.
Common questions
What does “oh dark thirty” mean?
an extremely early hour of the morning Literally: before the sun rises
Is “oh dark thirty” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.