Formulaic language

The term formulaic language is sometimes used to refer to multi-word collocations which are stored and retrieved holistically rather than being generated de novo with each use.

Examples
Examples of formulaic language include idioms, set expressions, rhymes, songs, prayers, and proverbs; they may also be taken to include recurrent turns of phrase within more ordinary sentence structures. These are notable in ordinary speech as well as in ritualized speech events such as sports broadcasts, weather reports, sermons, etc.