A common saying; a proverb; a saying that has a general currency.
- A proverbial expression; a proverb.
- An often-used word or phrase.
- One that represents a type, class, or quality: "Polyester got its déclassé reputation in the 1970s after cheap, poorly made double-knit leisure suits became a byword for bad taste” ( Fortune).
- An object of notoriety or interest: The eccentric poet was a byword in literary circles.
- An epithet.