Proverbial

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late Middle English: from Latin proverbialis, from proverbium (see proverb).

wiktionary

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proverbial ( comparative more proverbial, superlative most proverbial)

etymonline

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proverbial (adj.)

"pertaining to or resembling proverbs; mentioned in a proverb," late 15c., from Late Latin proverbialis "pertaining to a proverb," from proverbium (see proverb). Related: Proverbially (early 15c.).