The phrase "popular lexicon" refers to the words, phrases, and expressions that are commonly used and understood by many people in a particular society or culture. Full definition
@phoog In popular lexicon, it's an «accident» if it wasn't intentional. (law.stackexchange.com)
The Mesozoic is most famed for the Dinosaurs, and popular lexicon considers it the Age of the Dinosaurs (or Reptiles). (fossilmuseum.net)
Interestingly, the introduction of the word marijuana was unique to Hearst's empire and was not a term in the American popular lexicon until that time. (votehemp.com)