Are you taking issue with him calling "checkered history" an idiom?Geographer said:What's an idiom, Curious?
One entry found for idiom.
Main Entry: id·i·om
Etymology: Middle French & Late Latin; Middle French idiome, from Late Latin idioma individual peculiarity of language, from Greek idiOmat-, idiOma, from idiousthai to appropriate, from idios
1 a : the language peculiar to a people or to a district, community, or class : DIALECT b : the syntactical, grammatical, or structural form peculiar to a language
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 Monday week for "the Monday a week after next Monday")
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>
If so, I too wonder if there isn't a better term for it than "idiom".