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это не шутка stresses
gen.	it is no joke; not just kidding; it's no jesting matter; it is no laughing matter; no picnic (Оксана Od.Ua); it's no joke; it is not a laughing matter
это не шутки
Игорь Миг	it's a big deal

это не шутка: 17 phrases in 4 subjects

Banking	1
General	10
Informal	2
Makarov	4