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Svetonio attribuisce questa frase a Giulio Cesare che nel 49 a.C. attraversa il Rubicone dirigendosi verso Roma per combattere Pompeo. Quando i dadi son tirati non si torna indietro e così fa Cesare. Da allora questa locuzione latina è entrata nel linguaggio (non solo italiano!) proprio per intendere un’azione o una decisione dalla quale non si torna indietro.
La parola desueta del