n.
1.a manner of speaking that is natural to native speakers of a language
2.the usage or vocabulary that is characteristic of a specific group of people
3.the style of a particular artist or school or movement
4.an expression whose meanings cannot be inferred from the meanings of the words that make it up
Idiom of the Day
look out for (someone)
to provide protection and care for someone
"Please look out for my sister when she visits you this summer."