keep a cool head

keep a cool head

To maintain a calm demeanor and think clearly in a difficult, stressful, or troubling situation. I know you're anxious about this midterm exam, but just remember what we've gone over and try to keep a cool head. You have to keep a cool head during business negotiations or else you may end up getting the short end of the stick.
See also: cool, head, keep
Farlex Dictionary of Idioms.
See also:
  • keep a level head
  • on a knife-edge
  • even keel
  • keel
  • be under the cosh
  • cosh
  • hairy situation
  • breathe easy
  • get a grip of (oneself)
  • get a grip on (oneself)