In addition to, and to clarify, the other definition:
A person (often female) is dressed down when she is wearing clothes that do not accentuate her voluptuous parts (if any).
Joey turned up to work in his normal work clothes whilst all his colleagues had remembered to come in casual clothing, Poor Joey has some kind of Dress Down Syndrome.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".