[…] we introduced the notion of markedness shift, through which originally marked constructions develop into new unmarked constructions, and thus push the originally unmarked constructions out of work.
- Dik (1989), a pag.239

One type of loss of markedness is involved in what I call “markedness shift”. By this I mean a historical process through which an originally marked item loses its marked character (gets “demarked”), and thus makes room for the creation of a new marked form.
- Dik (1989), a pag.41