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keep (one's) head
To be and remain in a calm, stable, sensible, and pragmatic state or condition despite stress. My father has always been a rock of level-headed judgment and advice. Even during our family's lowest points, he's always kept his head.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
keep one's head
Fig. to remain calm and sensible when in an awkward situation that might cause a person to panic or go out of control. She was very angry. We had to calm her down and encourage her to keep her head. Always try to keep your head when others are panicking.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.