Noun
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an expression whose meanings cannot be inferred from the meanings of the words that make it up
- idiomatic expression - phrasal idiom - set phrase -
the style of a particular artist or school or movement
"an imaginative orchestral idiom"
- artistic style -
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"
"it has been said that a language is a dialect with an army and navy"
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a manner of speaking that is natural to native speakers of a language