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English definition of “not have a clue”

not have a clue

informal
B2 to be completely unable to guess, understand, or deal with something: "Who invented algebra?" "I haven't a clue." Don't ask your father which key to press - he hasn't got a clue about computers.Unaware
(Definition of not have a clue from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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