turn of phrase
A particular arrangement of words, as in I'd never heard that turn of phrase before, or An idiom can be described as a turn of phrase. This idiom alludes to the turning or shaping of objects (as on a lathe), a usage dating from the late 1600s.
|turn of phrase|
|a distinctive spoken or written expression; "John's succinct turn of phrase persuaded her that it would not be a good idea"|