ass crack of dawn

English

Etymology

From ass crack jocularly replacing crack in the (preexisting) noun phrase crack of dawn (= "break of dawn"); although ass crack (cleft, gap) and crack (break) are cognate, the jocularity nonetheless rests on the disjunction that is cognitively close to (albeit by some standards not technically) a pun.

Noun

ass crack of dawn (uncountable)

(Canada, US, vulgar) An intensifier, used in the same contexts as crack of dawn, but more intense.

Synonyms

butt crack of dawn; see also Thesaurus:dawn

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