The grey rock method is a strategy some people use when interacting with manipulative or abusive individuals. It involves becoming as unresponsive as possible to the abusive person’s behavior.
Jane tried to harass and manipulate Kate into breaking up with John. Instead of fighting, Kate began grey rocking her and Jane eventually backed off
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".