Definitions for: Rubicon

[n] a line that when crossed permits of no return and typically results in irrevocable commitment
[n] the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war

Webster (1913) Definition: Ru"bi*con, n. (Anc. geog.)
A small river which separated Italy from Cisalpine Gaul, the
province alloted to Julius C[ae]sar.

Note: By leading an army across this river, contrary to the
prohibition of the civil government at Rome, C[ae]sar
precipitated the civil war which resulted in the death
of Pompey and the overthrow of the senate; hence, the
phrase to pass or cross the Rubicon signifies to take
the decisive step by which one is committed to a
hazardous enterprise from which there is no retreat.

Synonyms: point of no return

See Also: bound, boundary, bounds, contrast, demarcation, dividing line, line

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