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Definitions

Rubicon

[roo-bi-kon] / ˈru bɪˌkɒn /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Schneiderman said it is "highly unlikely that the US will choose to use nuclear weapons against Iran. It is the ultimate Rubicon to cross."

From Barron's • Apr. 7, 2026

But history shows the current battle for the strait is just the latest iteration of a centuries-old fight to control the critical trade route—and why it has become a Rubicon for American presidents.

From The Wall Street Journal • Mar. 22, 2026

Barr already own a range of other soft drinks brands, including Rubicon and Bundaberg.

From BBC • Feb. 3, 2026

At some point, the proverbial Rubicon will be crossed, and there may be serious cause for alarm.

From MarketWatch • Jan. 13, 2026

Mr. Botha had long talked about the need to cross the Rubicon, but he never did it himself until that morning at Tuynhuys.

From "Long Walk to Freedom" by Nelson Mandela