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каменное лицо stresses
gen.	frozen face (scherfas); dead-pan face; impenetrable countenance; a poker face; a straight face; still face (MichaelBurov)
Gruzovik, fig.	stony face
slang	poker face; straight face

каменное лицо: 19 phrases in 4 subjects

General	13
Informal	1
Neologism	1
Slang	4