Synonyms:
parlance, idiom
Meaning: a manner of speaking that is natural to native speakers of a language
Usage examples
He learned by their parlance and Bible phrases to construct "short sentences of small words," but he had all along the idea that "the plain people are more easily influenced by a broad and humorous illustration than in any other way."
There wasn't a real stone in the whole outfit, and the worst part of it was that under the circumstances Henriette could not tell anybody over the teacups that Mrs. Rockerbilt was, in vulgar parlance, "putting up a shine" on high society.