Et tu, Brute definitions

et tu, Brute

realization, acknowledgment, and accusation that an apparent trusted friend or ally is actually an enemy - the expression was popularized by Plutarch's and Shakespeare's telling of the killing of Julius Caesar by conspirators including his previous friend Brutus
Found on https://www.businessballs.com/glossaries-and-terminology/latin-terms-and-ph

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et tu, Brute

and thou, Brutus!: alleged dying words of Julius Caesar uttered as his friend Brutus stabbed him.
Found on https://www.infoplease.com/dictionary/et-tu-brute

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