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оставаться спокойным stresses
gen.	rest; show no perturbation; keep quiet; keep calm (Andrey Truhachev); stay cool (kee46); rest easy (content with this state of things, etc., и т.д.)
austral., slang	cut the cackle; keep one's shirt on; without turning a hair
fig.	keep one's balance
Makarov.	perturbation; keep an equal mind; keep one's balance; keep one's head
psychol.	stay calm (Alex_Odeychuk)
оставайся спокойным
austral., slang	keep your hair on

оставаться спокойным: 3 phrases in 3 subjects

Business	1
General	1
Idiomatic	1