A Washington Post (October 18) article begins with the following passage under the headline, “Trump triples down on George W. Bush’s responsibility for 9/11.”
Donald Trump says he doesn’t flat out blame former president George W. Bush that the Sept. 11 terror attacks happened on his watch. But he can think of three reasons why one could hold Bush responsible. And, he might add, they are three things a President Trump would do very differently. “You always have to look to the person at the top,” Trump said Saturday in a telephone interview. “Do I blame George Bush? I only say that he was the president at the time, and you know, you could say the buck stops here.
I know the word, “double down” as a blackjack word, but I never heard of “triple down.”
Neither Cambridge online Dictionary nor Oxford Dictionaries carries this word.
Google Ngram shows both “double down” and “triple down” at respective 0.000.0037375 and minimal 0.000.0001722 incidence level.
What does “triple down” on somebody mean? Did Trump castigate G.W. Bush? Does it have anything to do with “three things” Trump will do if he is elected President? Is "triple down" a common word?