"Black widow" is a phrase used to describe a woman who marries or develops relationships with men, often multiple times, and then causes harm or even causes their deaths, sometimes for financial gain. Full definition
Like a female black widow spider consuming her mate, the latter part of the formula makes a meal of the former, leading to the collapse of any system based upon that formula. (religion.blogs.cnn.com)
While black widow bites are common and can be painful, only a fraction result in serious symptoms. (treehugger.com)
Let's just say, the female black widow is the hero we all need; those guys asked for it. (treehugger.com)