When a friend wrote in a Facebook post the other day that a certain political figure had “lost the plot,” my NOOB-dar came on. I wasn’t familiar with the phrase but it had the definite feel of a Britishism, and sure enough, it is.
The Oxford English Dictionary defines “lose the plot” as “to lose one’s ability to understand or cope with events; to lose one’s touch; to go off the rails.” There is a dubious 17th-century citation, with the next not coming till a 1984 quote from The Times, presumably about a fashion show: “Arabella Pollen showed sharp linens, lost the plot in a sarong skirt and brought out curvaceous racing silk and a show-stopping bow-legged Willie Carson.”
As to the phrase’s national origin, the OED doesn’t say. A 1994 article in The American Scholar claims it’s Australian. It would be interesting to hear about that from an Australian. In any case, it definitely is a Britishism, as shown in this Google Ngram Viewer chart comparing uses of the phrase “lost the plot” in books published in the U.S. and the U.K:
Interestingly, the first time it shows up in the New York Times, in 1998, it’s also in a fashion article:
From the parade of Mao worker jackets with frog closures and cheongsam dresses at Ferragamo to the indiscriminate layering of tulle and other sheer fabrics over trousers and skirts at Anna Molinari, many designers in Milan had a story’s worth of ideas, but they had lost the plot.
It’s been used a few dozen of times since then, most recently less than a week ago, in a May 14 article about entertainment mogul Sumner Redstone:
The legal fracas has changed Mr. Redstone’s public image from a firebrand whose business acumen and ruthlessness won him control of Viacom, Paramount Pictures and CBS, a $40 billion empire, into something quite different. In the local parlance, he lost the plot.