IdiomThe AbsurdEnglish

cross the Rubicon

Meaning: To take an irreversible step.

Example: “Once she handed in her resignation, she had crossed the Rubicon.”

Origin: In January 49 BC Julius Caesar led his army across the Rubicon, a small river marking the border of Italy, which Roman law forbade a general to cross in arms. It started a civil war; Suetonius reports he said "the die is cast." The metaphor is used in English from the early 17th century.

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