The difference between Crack of dawn and Sparrow-fart
When used as nouns, crack of dawn means the first moment of daylight, whereas sparrow-fart means a time very early in the day.
check bellow for the other definitions of Crack of dawn and Sparrow-fart
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Crack of dawn as a noun (idiomatic):
The first moment of daylight; before sunrise.
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Sparrow-fart as a noun (uncountable, UK, Australia, New Zealand, slang):
A time very early in the day; dawn.
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Sparrow-fart as a noun (countable):
A person or thing of no consequence.