Strong's Concordance

Original word: βόρβορος
Transliteration: borboros
Definition (short): mire
Definition (full): mud, filth

NAS Exhaustive Concordance

Word Origin: of uncertain origin
Definition: mud, filth
NASB Translation: mire (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Of uncertain derivation; mud -- mire.
KJV: But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.
NASB: It has happened to them according to the true proverb, "A DOG RETURNS TO ITS OWN VOMIT," and, "A sow, after washing, returns to wallowing in the mire."