A colloquial expression, not employed in formal discourse or writing.
The syntactical or structural form peculiar to any language; the genius or cast of a language.
An expression conforming or appropriate to the peculiar structural form of a language.
A combination of words having a meaning peculiar to itself and not predictable as a combination of the meanings of the individual words, but sanctioned by usage; as, an idiomatic expression; less commonly, a single word used in a peculiar sense.
The phrase forms peculiar to a particular author; as, written in his own idiom.