The definition of an adage is a saying that has come to be accepted as truth over time.
"The grass is always greener on the other side" is an example of an adage.
an old saying that has been popularly accepted as a truth
Origin of adageFrench ; from Classical Latin adagium, adagio ; from ad-, to + aio, I say ; from an unverified form agyo ; from Indo-European base an unverified form ??-, speak, say
A saying that sets forth a general truth and that has gained credit through long use. See Synonyms at saying. See Usage Note at redundancy.
Origin of adageFrench, from Old French, from Latin adagium.