idiom idiom /ˈɪdiːəm/

noun

1. () A manner of speaking that is natural to native speakers of a language  ( parlance , idiom )
   a manner of speaking that is natural to native speakers of a language
   
2. () The style of a particular artist, school or movement  ( artistic style , idiom )
   the style of a particular artist, school or movement
    An imaginative orchestral idiom
   an imaginative orchestral idiom
   
3. () The usage or vocabulary that is characteristic of a specific group of people  ( accent , idiom , dialect )
   the usage or vocabulary that is characteristic of a specific group of people
    The immigrants spoke an odd dialect of English
   the immigrants spoke an odd dialect of English
    He has a strong German accent
   he has a strong German accent
    It has been said that a language is a dialect with an army and navy
   it has been said that a language is a dialect with an army and navy
   
4. An expression whose meanings cannot be inferred from the meanings of the words that make it up  ( idiom , idiomatic expression , phrasal idiom , phrase , set phrase )
   an expression whose meanings cannot be inferred from the meanings of the words that make it up