Synonyms of 'forget yourself'
▷ See forget
He was so fascinated by her beauty that he forgot himself.
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act up (informal)
If someone, especially a child, misbehaves, they behave in a way that is not acceptable to other people.
When the children misbehaved she was unable to cope.
Thesaurus for forget yourself from the Collins English Thesaurus
to act in an improper manner