During or throughout the night, especially during the evening or night just past.
Let it run overnight and we'll check on it in the morning.
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(figurative) In a very short (but unspecified) amount of time.
They delivered the package overnight.
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Occurring between dusk and dawn.
The overnight ferry docked at 10 a.m.
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Add your own interpretation of "overnight".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.