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чувствовать себя скверно stresses
gen.	not to be up to par (Excuse me; I'm not up to par today. Helene2008); feel out of sorts (VLZ_58); be sick as a dog
Gruzovik	feel bad; feel poorly
amer.	feel like two cents (Andrey Truhachev)
idiom.	be down (Yeldar Azanbayev)
inf.	feel like nothing on earth (Andrey Truhachev)
Makarov.	be sick as a dog; be sick as a horse
pragm.	feel like shit (Andrey Truhachev)
slang	feel like a piece of half-chewed meat (VLZ_58); feel like ten pounds of shit in a five-pound bag (VLZ_58)