overnight - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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overnight

adjective, adverb uk   /ˌəʊ.vəˈnaɪt/  us   /ˌoʊ.vɚ-/

overnight adjectiveadverb (TIME OF DAY)

B1 for or during the night: an overnight stop in Paris You can stay overnight if you want to. Don't forget to pack an overnight bag (= a bag for things that you need when you stay away from home for a night).
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overnight adjectiveadverb (SUDDENLY)

C2 suddenly and unexpectedly: She became a star overnight. The book was an overnight success.
(Definition of overnight from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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