The chemical reactions and pathways resulting in the breakdown of a glycoprotein, a protein that contains covalently bound glycose (i.e. monosaccharide) residues; the glycose occurs most commonly as oligosaccharide or fairly small polysaccharide but occasionally as monosaccharide. [ GOC:go_curators https://www.worldcat.org/search?q=bn%3A0198506732 ]
Synonyms: glycoprotein degradation glycoprotein breakdown glycoprotein catabolism