"A speech form or an expression of a given language that is peculiar to itself grammatically or cannot be understood from the individual meanings of its elements, as in keep tabs on."
"A specialized vocabulary used by a group of people; jargon: legal idiom."
"For the idiom of words very little she heeded,
provided the matter she drove at succeeded.
She took and gave languages just as she needed."
"From Greek, idiousthai: to make one's own"
"A coding idiom is a solution to a commonly occurring programming problem."
idiom ['idiem] n. 1. kifejezes