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rubicon has 1 distinct synonym spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
a line that when crossed permits of no return and typically results in irrevocable commitment
Synonyms, antonyms and the broader and narrower relations for rubicon come from Princeton University’s WordNet. Full sources and licences.