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English definition of “clear head”

clear head

noun [C usually singular] uk   us  
the ability to think clearly: I won't have another drink, thanks. I need to have a clear head for my meeting in the morning.
clear-headed
adjective uk   /ˌklɪəˈhed.ɪd/ us    /ˌklɪr-/
able to think clearly
(Definition of clear head from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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