What does adage mean?
The definition of adage
Ad”age, n.
Etym: [F. adage, fr. L. adagium; ad + the root of L. aio I say.]

An old saying, which has obtained credit by long use; a proverb. Letting “I dare not” wait upon “I would,” Like the poor cat i’ the adage. Shak.

Synonyms
— Axiom; maxim; aphorism; proverb; saying; saw; apothegm. See Axiom.