The large hidden belly or second stomach that is found protruding from a shrew's pants just below the belt. This expansive secondary belly is usually quite large and dough-like and when seated it looks like a large balloon is being kept in their pants. Commonly referred to as a "bunt" or a "fupa", the difference is that "Shrew's Gold" refers to the likeness however it belongs to a hideous witchlike female, also known as a shrew.
When Mrs. B was tightening her belt, Arthur told her to cinch it between her belly and her shrew's gold.
When Matilda began overeating, she stated that once her stomach became too large, the extra pounds started to form in her second belly which she referred to as her shrew's gold.