Fallon wasn't too shabby himself, performing admirable renditions of Iggy Azalea's "Fancy" and Styx's "Mr. Roboto."
We crossed several rivers; besides the “Echo,” one called the “Styx,” the other the “Lethe.”
To swear by the Styx was to take "the great oath of the gods."
The unlettered bard has probably confused "Styx" with the kindling, "yelding," of hell-fire.
I was upon the Styx, and in my rower I recognised the redoubtable Charon.
The fellow whose motor sent me to the brink of the Styx, is now preparing me by night light to take the 33d degree of happiness.
To-morrow, was it not, that you were to journey to Tyburn and from thence across the Styx?
The Styx, the Cocytus, and the Phlegethon present their waves to your acceptance.
That faith is darker to me than the rolling blackness of the Styx.'
As Zeus had sworn by the Styx to grant her request, he was bound.
late 14c., the Greek river of the Underworld, cognate with Greek stygos "hatred," stygnos "gloomy." Oaths sworn by it were supremely binding and even the gods feared to break them. The adjective is Stygian.