From Longman Dictionary of Contemporary Englishby day/nightby day/nightDURINGduring the day or the night a tour of Paris by night → by
Examples from the Corpus
by day/night• Very often bream have remarkably fixed movements and follow the same watery paths day by day.• As the war proceeded, however, several started operating by night and with all the lights blacked out.• He slept more than any other president, whether by day or by night.• Look at the teamster on the highway, wending to market by day or night; does any divinity stir within him?• On the Earth there is regularly more evaporation - effusions of water vapour from the surface - by day than by night.• At my home in Tucson, summer days that reach I1O0F may be followed by nights that drop to 700F.• The legend concerns three builders of a castle who found that the work they did by day was undone by night. 