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gen.	clutch; double one's fist (UniversalLove); make a fist (сжать руку в кулак MartiniDetka); close one's fist (Abysslooker)
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gen.	double fists; bunch fists (Sweetlana); clench one's fists (Liv Bliss); double one's fists
Makarov.	clench one's fist

сжать кулак: 14 phrases in 2 subjects

General	10
Makarov	4