noun
EXAMPLES FROM CORPUS
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It would be dawn soon, then sun-up , and he did not know what he would see.
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Probably since sun-up , and he would not stop until it was too dark to work any longer.
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These are dusk to around 1.30 a.m., and from first glimmer of light to an hour or so after sun-up .
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They slipped away just before sun-up .
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To reach this desolate spot you set off at sun-up and head toward mountain ranges which scarcely ever get closer.
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We have spent two whole days from sun-up till sun-down in rapt conversation.