Check out the translation for 'to be beside oneself' on Nglish dictionary

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to be beside oneself

estar fuera de sí

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to, be, beside, oneself.

beside preposition

al lado de, junto a

•She sat beside him during dinner.
•The man beside her was wearing a brown suit and hat.
•They were walking beside me.
•Stand beside the statue and I'll take your picture.
•Their house is beside a small lake.
More examples
•These problems seem unimportant beside the potential benefits of the new system.
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