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beside oneself - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

Possibly derived from Ancient Greek παράνοια (paránoia, madness), from παράνοος (paránoos, demented), from παρά (pará, beyond, beside) + νόος (nóos, mind, spirit), with "beside mind" evolving into "beside oneself".

Prepositional phrase

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beside oneself

  1. (idiomatic) Overcome; consumed by an emotion.

    His widow was beside herself with grief.

consumed by an emotion