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do sb's head in

UK informal

Definition

to make someone feel confused and unhappy: Getting up at four o'clock every morning was doing my head in. I've been trying to make sense of all these figures and it's doing my head in.Puzzle and confuseDifficult to understandMaking people sad, shocked and upset
(Definition of do sb's head in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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