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/əʊvə(ɹ)ˈnaɪt/ · adverb
During or throughout the night, especially during the evening or night just past..
Let it run overnight and we'll check on it in the morning.
They delivered the package overnight.
I have heard of a man, who having been drunk overnight, and passed over a very narrow Bridge, which no sober Horseman durst attempt, being brought the next day to see what danger he went through, fell down in a swoon upon the sight of it.
[…]then put the glass into a damp cellar, on sand, and the gold will overnight shoot into crystals, which take out, and let them dissolve again in distilled vinegar[…].
There was also hairdressing: hairdressing, too, really was hairdressing in those times — no running a comb through it and that was that. It was curled, frizzed, waved, put in curlers overnight, waved with hot tongs;[…].
Overnight, as the storm bore down on urban flood zones, city officials ramped up emergency spaces to shelter thousands more people, mostly in public schools and colleges.
The change seemed to happen overnight.
Overnight, the vivacious young actress became a caricature, a relic of the previous decade, whose hard-partying socialite image seemed frivolous and out of touch amid the ensuing years of the Great Depression.
Use overnight when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Overnight means During or throughout the night, especially during the evening or night just past..
Common synonyms include long, nightlong.
The opposite depends on the specific sense.
Let it run overnight and we'll check on it in the morning.
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