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Overnight

/ˌəʊvəˈnaɪt/

Happening or done in the course of a single night, or very quickly and unexpectedly.

Synonyms:

Jennifer had even packed Anne's overnight bag.

"Aye, good chance we end up in the Market overnight."

The new policy was implemented overnight.

Derived from Old English ofer meaning beyond or after and niht, referring to the dark period after sunset.

46 mentions per 1 million words

Often

Hint: Frequency according to COCA