GO:0009223:   pyrimidine deoxyribonucleotide catabolic process
The chemical reactions and pathways resulting in the breakdown of a pyrimidine deoxyribonucleotide, a compound consisting of nucleoside (a pyrimidine base linked to a deoxyribose sugar) esterified with a phosphate group at either the 3" or 5"-hydroxyl group of the sugar.