Overnight or Over Night – What’s the Difference? - Writing Explained
https://writingexplained.org/overnight-or-over-night
WEBIs it overnight or over night? Overnight can be an adjective or an adverb. Either way, it refers to something that happens in the span of time between one day and the next day. In summary, Overnight is one word. You should not use over night. Unless you are telling someone how much you like night, use overnight.
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