I am going to preface this essay by admitting that I haven’t gambled in a very long time, and for some reason when I initially thought of the “doubling down” metaphor I only had a nebulous idea that it applied to card games. So, after typing this sentence I googled it and found that it relates, exclusively, to blackjack. I assume I’m in the minority of people who were unaware of this, however, there are lots of expressions we are carelessly using without any real knowledge of their etymological and, in the case of “double down,” metonymic origins.
