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clear conscience stresses
gen.	для успокоения совести (bigmaxus)
psychol.	очистить совесть (Andrey Truhachev); очищать совесть (Andrey Truhachev); чистая совесть
relig.	добрая совесть (Alex_Odeychuk)
clear one's conscience
gen.	очистить совесть
cliche.	облегчить совесть (Having had his story dismissed or ignored by authorities for nearly a decade, Olver finally decided to share his account with the world in the hopes of clearing his conscience over what he and his crew had found. coasttocoastam.com ART Vancouver)
psychol.	облегчить свою совесть (Andrey Truhachev); успокоить свою совесть (Andrey Truhachev)

clear conscience: 26 phrases in 7 subjects

Figure of speech	2
General	7
Idiomatic	4
Makarov	1
Proverb	9
Psychology	2
Religion	1