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English definition of “be beside yourself”

be beside yourself

C2 If you are beside yourself with a particular feeling or emotion , it is so strong that it makes you almost out of control : He was beside himself with grief when she died .Of unsound mindStupid and sillyStrong feelings Grammar:Beside or besides?Grammar:BesideBeside is a preposition. It means ‘at the side of’ or ‘next to’. It is rather formal:Grammar:BesidesBesides is a preposition or a linking adverb. It means ‘in addition to’ or ‘also’:
(Definition of be beside yourself from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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