Keep One's Head Meaning

(idiomatic) To remain calm, reasonable, level-headed, especially in a situation likely to cause distress.

Example: 1895, Rudyard Kipling, “If—”:
  If you can keep your head when all about you
  Are losing theirs and blaming it on you . . .
1910, John Buchan, Prester John, ch. 16:
  The ruffian kept his head, and though the dog's teeth were in his shoulder, he managed to get his right hand free.
2008, "Mother Throws 7 Kids Out Window To Save Them From Fire," CityNews (Canada), 7 March (retrieved 12 Dec. 2009):
  Officials are calling the woman a hero for keeping her head and finding the only way out amid the panic of the smoke and flames.