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под покровом ночи stresses
gen.	under cover of darkness (Notburga); night-clad (Victorian); under favor of the night; using the cover of night (bigmaxus); by night; under cloud of night; under the screen of night
fig.of.sp.	under the veil of night (Maria Klavdieva)
idiom.	in the dead of night (Someone was sneaking around in the dead of night. Wakeful dormouse)
Makarov.	under the screen of night; under cover of night; under favour of the darkness; under the cloak of night; under the cope of night; under the shelter of night

под покровом ночи: 3 phrases in 2 subjects

Informal	2
Makarov	1