The phrase "further marginalization" means excluding or pushing someone to the edges or fringes of society even more, making them feel even more isolated and not included. Full definition
None of this means, however, that we should accept further marginalization of pain and opioid therapy patients. (businessinsider.com)
What happened from 2006 - 11 in Hartford may have helped some kids, but came along with further marginalization of the most vulnerable children and families in our city. (commons.trincoll.edu)
London's cognitive difficulties, however, seem to render Brussels increasingly impatient, and the further marginalization of Europe on the international scene will hopefully embolden it to take a firmer stance towards Britain and demand a clear statement as to its future in Europe. (blog.politics.ox.ac.uk)