• come! come!, keep cool!, keep your hair on!
• calm, ectothermal, imperturbable, nonchalant, unemotional
• imperturbably, in cold blood
• to keep one's wits about one
• to keep one's balance, to keep one's head
• to lose face, to lose one's self-control
• to keep one's hair on, to save face, to save one's face