down at heel (down-at-heel) — потрепанный, обшарпанный, неряшливо одетый, неприглядный, жалкий etc.

Used about someone who is untidy and wears old clothes, or about smth. that looks old and in bad condition

Example 1: People who come to the rehab center are down at heel, they smell a bit, and they often make nice middle-class volunteers feel uncomphortable.

Example 2: Laura lived in a house with a few other students, described by her parents as down-at-heel.