Idiom, also called idiomaticness or idiomaticity, is the syntactical, grammatical, or structural form peculiar to a language.[1] Idiom is the realized structure of a language, as opposed to possible but unrealized structures that could have developed to serve the same semantic functions but did not.
The grammar of a language (its morphology, phonology, and syntax) is inherently arbitrary and peculiar to a specific language (or group of related languages). For example, although in English it is idiomatic (accepted as structurally correct) to say "cats are associated with agility", other forms could have developed, such as "cats associate toward agility" or "cats are associated of agility".[2] Unidiomatic constructions sound wrong to fluent speakers, although they are often entirely comprehensible. For example, the title of the classic book English as She Is Spoke is easy to understand (its idiomatic counterpart is English as It Is Spoken), but it deviates from English idiom in the gender of the pronoun and the inflection of the verb. Lexical gaps are another key example of idiom.
^Garner, Bryan A. (2016), Garner's Modern English Usage (4th ed.), headword "accompanied", ISBN978-0190491482, Idiom requires accompanied by, not *accompanied with—e.g.: '[…] sliced in half and accompanied with [read accompanied by] no more than a small scoop of ice cream.'{{citation}}: CS1 maint: location missing publisher (link)
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