Etymology

as a dog returns to his vomit, so a fool repeats his folly

Today it means: Foolish people repeatedly do foolish things. Full definition →

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The story

* 1611, King James Version of the Bible, Book of Proverbs, 26:11 *: As a dog returneth to his vomit, so a fool returneth to his folly. Originally from Hebrew: *::כְּכֶלֶב שָׁב עַל קֵאוֹ כְּסִיל שׁוֹנֶה בְאִוַּלְתּוֹ

Etymology from Wiktionary, CC BY-SA 4.0.