Definition of overnight adverb from the Oxford Advanced American Dictionary

     

    overnight

     adverb
    adverb
    NAmE//ˌoʊvərˈnaɪt//
     
     
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  1. 1 during or for the night We stayed overnight in the city after the theater.
  2. 2suddenly or quickly Don't expect it to improve overnight. She became famous overnight.
See the Oxford Advanced Learner's Dictionary entry: overnight

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