- night and day
- ALL THE TIME, around the clock, morning, noon, and night, day in, day out, ceaselessly, endlessly, incessantly, unceasingly, interminably, constantly, perpetually, continually, relentlessly; informal 24-7.→ night
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adverbEtymology: Middle English, from Old English næht & dæg* * *
day and night/night and day/ phraseall the timeElectricians have been working day and night to restore electricity supplies to the area.
Thesaurus: all the time and alwayssynonymMain entry: day* * *
she studied night and day
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ˌnight and ˈday | ˌday and ˈnight idiom•
The machines are kept running night and day.
Useful english dictionary. 2012.