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ни рыба ни мясо stresses
gen.	neither fish nor good red herring; neither fish; flesh nor fowl; between hay and grass; half-and-halfer; neither fish, flesh nor good red herring; half angel half bird; neither fish nor flesh (nor good red herring); betwixt hawk and buzzard (Anglophile); half and halfer
Игорь Миг	neither fish or fowl
idiom.	neither fish nor fowl (Александр_10); neither here nor there (Andrey Truhachev); betwixt and between (george serebryakov)
inf.	wishy-washy; half and half (Rust71); wimp (перен. о человеке Val_Ships); duff (blankabella)
proverb	betwixt and between; fair to middling; neither fish, flesh nor fowl; neither fish, nor flesh
proverb, disappr.	neither fish nor flesh (used as pred.) (of persons)
slang	neither shit nor Shinola (Anglophile)
ни рыба, ни мясо
gen.	between hay and grass; flesh nor fowl; flesh nor good red herring; neither fish, flesh nor fowl; neither the one nor the other fish nor fowl; milk and water (Tracer)
Gruzovik	neither one nor the other
idiom.	neither fish, flesh, nor good red herring
inf.	blandy (Fidelia); Swing and a miss (An idiom (related to baseball) that is typically used to describe a joke that was either unfunny, inappropriate or misunderstood pe4en4ik)
proverb	neither fish nor flesh
перен. ни рыба, ни мясо
inf.	buck-eighty (fa158)

ни рыба ни мясо: 5 phrases in 3 subjects

General	3
Makarov	1
Proverb	1