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English definition of “be off your head”

be off your head

informal
to be crazy: You must be off your head going out in this weather!Of unsound mindStupid and sillyDrunkenness and sobriety to not be in control of your behaviour because you have drunk too much alcohol or taken drugs: Hannah was off her head as usual.Drunkenness and sobrietyDrugs - general wordsSpecific types of drug
(Definition of be off your head from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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