idiomatic

/ˌˈɪdiəˌmædɪk/

/ɪdiəˈmætɪk/

Anything idiomatic relates to expressions that cannot be understood according to their literal meaning, like "it's raining cats and dogs" or "bite the bullet."

An idiom is a turn of phrase, like saying a restaurant has gone to the dogs, which has nothing to do with dogs but means the restaurant has seen better days. You could say an idiom is an idiomatic expression. You could also say an idea — like how politics is like a horserace — is idiomatic. When you're learning a foreign language, idiomatic speech — which is natural to native speakers — is one of the hardest things to master.

Definitions of idiomatic

1. adjective

   of or relating to or conforming to idiom
   “idiomatic English”

   synonyms: idiomatical