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крепкий орешек stresses
gen.	toughie; strong meat; a hard nut to crack (о человеке); a tough nut to crack; tall order (Anglophile); hard row to hoe (Anglophile); back breaker
Игорь Миг	is no slouch (This guy is no slouch.); tough person
amer.	a tough cookie (She's a very tough cookie and an amazing person mentally and physically. Val_Ships); tough as nails (Val_Ships)
amer., slang	funsie; funsey
fig., explan.	nut (В.И.Макаров)
idiom.	twenty-minute egg (A very hard-boiled person; one who is tough and unsentimental; Встретилось также "forty-minute eggs" wiktionary.org markvidov); too tough to be boiled (Drozdova); hard nut (непробиваемый человек ART Vancouver)
inf.	back-breaker; tough nut (Andrey Truhachev); tough kid (Andrey Truhachev); thinker (a question you have to think about SirReal)
Makarov.	hard nut to crack
new.zeal.	Hard case
proverb	a hard nut to crack
slang	tough row to hue (о деле, задаче); roughneck; tough cookie; tough customer; tough guy; tough egg nut to crack (о деле, задаче); tough egg to crack; tough nut to crack; tough row to hoe (о деле, задаче); toughy
"крепкий орешек"
amer.	a hard row to hoe

крепкий орешек: 8 phrases in 6 subjects

Business	1
Figure of speech	2
General	2
Makarov	1
Mass media	1
Slang	1