What does "drag out an ignoble existence" mean?

"drag out an ignoble existence" is an idiom, which refers to the behavior or practice of harming others and benefiting themselves by unscrupulous means. Among them, "drag out an ignoble existence" refers to taking immoral measures for one's own survival, and "familiarity" refers to using the achievements or labor of others to obtain one's own interests through improper means.