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English definition of “clear head”

clear head

noun [C usually singular]    
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.Drunkenness and sobriety clear-headed     /ˌklɪəˈhed.ɪd/ US  /ˌklɪr-/ adjective able to think clearlyLogic and reason
(Definition of clear head noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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