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be like a bear with a sore head

(US also like a (real) bear) informal

Definition

to be in a bad mood that causes you to treat other people badly and complain a lot: You're like a bear with a sore head this morning. What's wrong with you?Bad-tempered
(Definition of be like a bear with a sore head from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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