cool head

cool head

The ability to remain calm and rational during stressful situations. The successful outcome of the hostage situation was due to the police officer's cool head.
See also: cool, head

a cool head

COMMON If you have a cool head, you remain calm in difficult situations. I have to keep a cool head and try not to let my anger show. I value her cool head when I'm trying to come to a decision.
See also: cool, head