Here you will find one or more explanations in English for the word Rubicon.
Also in the bottom left of the page several parts of wikipedia pages related to the word Rubicon and, of course, Rubicon synonyms and on the right images related to the word Rubicon.
Rubicon
Rubicon 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.
Meaning of Rubicon from wikipedia