idiom

noun

1. 1

   the style of a particular artist or school or movement

   an imaginative orchestral idiom

2. 2

   a manner of speaking that is natural to native speakers of a language

3. 3

   an expression whose meanings cannot be inferred from the meanings of the words that make it up

4. 4

   the usage or vocabulary that is characteristic of a specific group of people

   the immigrants spoke an odd dialect of English

   he has a strong German accent