A few months back I ran the following poll. The results surprised me.

I had imagined that Simonides made things clear:

Simonides, fr. 356

“Everything comes to a single, dreadful Charybdis—
The great virtues and wealth the same.”

πάντα γὰρ μίαν ἱκνεῖται δασπλῆτα Χάρυβδιν,
αἱ μεγάλαι τ’ ἀρεταὶ καὶ ὁ πλοῦτος.

No? Ok. Here’s a proverb and an explanation

Michael Apostolios, Collectio Paroemiarum 16.49

“Avoid Kharybdis and come close to Skyla.” This is similar to the saying, “I avoided it by finding a better evil”

They say about Skyla that she was a Tyrrhenian woman, something if a beast, who was a woman down to the navel but she grew dog heads beneath that point. The rest of her body was a serpent. This kind of a cerature is very silly to imagine. But here is the truth. There were the islands of the Tyrrenians, which used to raid the coasts of Sicily and the Ionian bay. There was a trirereme which had the named Skyla. That trireme used to overtake other ships often and use their food and there was many a story about it. Odysseus fled that ship. trusting a strong and favorable wind and he told this story in Corcyra to Alkinoos, how he was pursued and how he fled and what the shape of the ship was. From these stories, the myth was formed.”

Τὴν Χάρυβδιν ἐκφυγὼν, τῇ Σκύλῃ περιέπεσον:
ὁμοία τῇ· ῎Εφυγον κακὸν εὗρον ἄμεινον

Λέγουσι περὶ Σκύλης ὡς ἦν Τυῤῥηνία, θηρίον τι, γυνὴ  μὲν μέχρι τοῦ ὀμφαλοῦ, κυνῶν δὲ ἐντεῦθεν αὐτῇ προσπεφύκασι κεφαλαί· τὸ δ’ ἄλλο σῶμα ὄφεως. τοιαύτην δὲ φύσιν ἐννοεῖν πολὺ εὔηθες· ἡ δὲ ἀλήθεια αὕτη· Τυῤῥηνίων νῆσοι ἦσαν, αἳ ἐληΐζοντο τὰ περίχωρα τῆς Σικελίας καὶ τὸν ᾿Ιόνιον κόλπον· ἦν δὲ ναῦς τριήρης ταχεῖα τό τε ὄνομα Σκύλα· αὕτη ἡ τριήρης τὰ λοιπὰ τῶν πλοίων συλλαμβάνουσα πολλάκις εἰργάζετο βρῶμα, καὶ λόγος ἦν περὶ αὐτῆς πολύς· ταύτην τὴν ναῦν ᾿Οδυσσεὺς σφοδρῷ καὶ λαύρῳ πνεύματι χρησάμενος διέφυγε, διηγήσατο δὲ ἐν Κερκύρᾳ τῷ ᾿Αλκινόῳ, πῶς ἐδιώχθη καὶ πῶς ἐξέφυγε, καὶ τὴν ἰδέαν τοῦ πλοίου· ἀφ’ ὧν προσανεπλάσθη ὁ μῦθος.

Ok. Maybe that wasn’t clear.

Heraclitus, Homeric Problems 70

“Charybdis is an obvious name for luxury and endless drinking. Homer has allegorized manifold shamelessness in Skylla, which is why she would logically have a belt of dogs, guardians for her rapacity, daring, and pugnacity. “

Καὶ Χάρυβδις μὲν ἡ δάπανος ἀσωτία καὶ περὶ πότους ἄπληστος  εὐλόγως ὠνόμασται·  Σκύλλαν δὲ τὴν πολύμορφον ἀναίδειαν ἠλληγόρησε, διὸ δὴ κύνας οὐκ ἀλόγως ὑπέζωσται προτομαῖς ἁρπαγῇ, τόλμῃ καὶ πλεονεξίᾳ πεφραγμέναις·

Yeah, that doesn’t help matters. How about this?

Philo, On Dreams, 70

“But you, go away from “the smoke and the wave” and depart the ridiculous concerns of mortal life as from that fearsome Charybdis without touching it at all, don’t even, as the people say, brush it with your littlest toe.”

ἀλλὰ σύ γε τοῦ μὲν “καπνοῦ καὶ κύματος ἐκτὸς” βαῖνε καὶ τὰς καταγελάστους τοῦ θνητοῦ βίου σπουδὰς ὡς τὴν φοβερὰν ἐκείνην χάρυβδιν ἀποδίδρασκε καὶ μηδὲ ἄκρῳ, τὸ τοῦ λόγου τοῦτο, ποδὸς δακτύλῳ ψαύσῃς.

Plutarch, with an assist

Plutarch, Fr. 178, Stobaeus 4.52 from his On the Soul [Plutarch uses the same image elsewhere]

“For satiety seems to be becoming worn out in pleasures from the soul suffering in some way with the body, since the soul does not shirk from its pleasures. But when it is interwoven, as it is said, with the body, it suffers the same things as Odysseus, just as he was held, clinging to the fig tree, not because he desired it or delighted in it, but because he feared Charybdis lurking below him. The soul clings to the body and embraces it in this way not because of goodwill or gratitude but because it fears the uncertainty of death.

As wise Hesiod says, “the gods keep life concealed from human beings.” They have not tied the soul to the body with fleshly bonds, but they have devised and bound around the mind one cell and one guard, our uncertainty and distrust about our end. If a soul had faith in these things—“however so many await men when they die”, to quote Heraclitus—nothing would restrain it at all.”

 καὶ γὰρ ὁ κόρος κόπος ἐν ἡδοναῖς ἔοικεν εἶναι τῷ μετὰ σώματός τι τὴν ψυχὴν πάσχειν, ἐπεὶ πρός γε τὰς αὑτῆς ἡδονὰς οὐκ ἀπαγορεύει. συμπεπλεγμένη δέ, ὥσπερ εἴρηται, τῷ σώματι ταὐτὰ τῷ Ὀδυσσεῖ πέπονθεν· ὡς γὰρ ἐκεῖνος τῷ ἐρινεῷ προσφὺς εἴχετο καὶ περιέπτυσσεν οὐ ποθῶν οὐδ᾿ ἀγαπῶν ἐκεῖνον, ἀλλὰ δεδιὼς ὑποκειμένην τὴν Χάρυβδιν, οὕτως ἔοικεν ἡ ψυχὴ τοῦ σώματος ἔχεσθαι καὶ περιπεπλέχθαι δι᾿ εὔνοιαν οὐδεμίαν αὐτοῦ καὶ χάριν, ἀλλ᾿ ὀρρωδοῦσα τοῦ θανάτου τὴν ἀδηλότητα.

κρύψαντες γὰρ ἔχουσι θεοὶ βίον ἀνθρώποισι

κατὰ τὸν σοφὸν Ἡσίοδον, οὐ σαρκίνοις τισὶ δεσμοῖς πρὸς τὸ σῶμα τὴν ψυχὴν κατατείναντες, ἀλλ᾿ ἕνα δεσμὸν αὐτῇ καὶ μίαν φυλακὴν μηχανησάμενοι καὶ περιβαλόντες, τὴν ἀδηλότητα καὶ ἀπιστίαν τῶν μετὰ τὴν τελευτήν· ἐπεὶ τήν γε πεισθεῖσαν, ὅσα ἀνθρώπους περιμένει τελευτήσαντας καθ᾿ Ἡράκλειτον, οὐδὲν ἂν κατάσχοι.”

So, to be clear:  Charybdis=death.