keep a clear head
(redirected from keeps a clear head)keep a clear head
To maintain a rational manner, often because one is not under the influence of alcohol or drugs. You need to keep a clear head when you make a big decision like that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have/keep a clear ˈhead
be able to think clearly, especially because you have not had any alcohol, drugs, etc: Don’t give me any wine, I must keep a clear head for the meeting this afternoon. OPPOSITE: a thick headFarlex Partner Idioms Dictionary © Farlex 2017