Widow Maker
  
The “widow maker” is a special term, since it’s used in so many industries. In all of them, it refers to something that’s going to kill someone soon, possibly metaphorically. It was first used in the medical and forestry industries, where it really meant it (the death part). But nowadays, it's used more metaphorically. For instance, in finance, it can mean a stupid-risky investment, which could result in a huge loss.
Fun fact: there’s even a burger called the “widow maker.” It’s got onion rings, bacon, avocado, and much, much more. Did you figure out the message of the widow maker? Since’s it’s old-timey, it’s a bit sexist, but basically the idea is that whatever “thing” would kill a married man, thereby “making a widow."