One, two, three, four, etc., before day-break. A student who sits up all night, and goes to bed at one, two, three, etc., is said to work till the small hours of the morning, or to go to bed in the small hours of the morning.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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