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English definition of “overnight”

overnight

adjective     /ˈəʊvənaɪt/
for or during the night : an overnight stay/stop We made an overnight stop in Paris . Stocks in Hong Kong closed moderately higher encouraged by overnight gains on Wall Street .
sudden and unexpected : Like many so-called overnight successes, she had been working hard for quite some time .
(Definition of overnight adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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