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и днём, и ночью stresses
gen.	both day and night; morning, noon and night (lexicographer)
и днём и ночью
gen.	night and day

и днём и ночью: 79 phrases in 23 subjects

Agriculture	1
Astronautics	1
Aviation medicine	6
Figurative	1
Figure of speech	1
General	27
Idiomatic	1
Informal	1
Makarov	19
Mass media	2
Medical	1
Military	4
Nautical	1
Physiology	1
Proverb	3
Rail transport	1
Religion	1
Rhetoric	2
Saying	1
Slang	1
Technology	1
Transport	1
Uncommon / rare	1