Don’t be an idiom! Just kidding…..read on for more info…..
An idiom is a noun:
1. a : the language peculiar to a people, district, community, or class :dialec
2. an expression, in the usage of a language that is peculiar to itself either grammatically (as no, it wasn’t me) or in having a meaning that cannot be derived from the conjoined meanings of its elements (as ride herd on for “supervise”)
3. a style or form of artistic expression that is characteristic of an individual, a period or movement, or a medium or instrument <the modern jazz idiom>; broadly : manner, style <a new culinary idiom>
First known use was in 1588; from Middle French & Late Latin; Middle French idiome, from Late Latin idioma (an individual peculiarity of language), from Greek idiōmat-, idiōma, from idiousthai (to appropriate), from idios