be oneself

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be oneself (third-person singular simple present is oneself, present participle being oneself, simple past was oneself, past participle been oneself)

1. (idiomatic) To behave or act naturally, without regard to how this behavior is perceived by others.
2. (idiomatic) To function physically and mentally as one normally does.[1]

• This is most commonly used in the imperative, as advice.
• Often used in the negative: "he's not himself today".

• find oneself
• to thine own self be true