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он воды не замутит stresses
gen.	he looks as if butter would not melt in his mouth (Franka_LV); he could not hurt a fly; he won't cause any trouble; he is as meek as a lamb
Makarov.	he would not hurt a fly
proverb	he wouldn't hurt a fly
она воды не замутит
Makarov., saying.	she looks as if butter would not melt in her mouth