Longman Dictionary of Contemporary English homepage

overnight

1 adverb
     
Related topics: Daily Life
o‧ver‧night1
1D for or during the night:
Pam's staying overnight at my house.
2 suddenly or surprisingly quickly:
He became a millionaire overnight.
happen/appear/change overnight
Reputations are not changed overnight.
! Do not talk about 'an overnight' because overnight is never a noun. It is either an adverb or an adjective.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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