expression, noun-modifying (irregular)
so-called; what is commonly called
Fixed prenominal phrase used to introduce a colloquial or popular name for something. Often followed by a noun.
俗に言う「スマホ依存症」は、正式な病名ではない。
What is commonly called 'smartphone addiction' is not an official medical term.
あの地域では、俗に言う「お化け屋敷」が観光名所になっている。
In that area, what is popularly known as a 'haunted house' has become a tourist attraction.