have a clear head

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have a clear head

To be able to act in a rational manner, often because one is not under the influence of alcohol or drugs. You need to have a clear head when you make a big decision like that.
See also: clear, have, head

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 head
See also: clear, have, head, keep