“That’s all she wrote” is an American phrase used to say that there is nothing else to say about a subject.
And where did it come from? Well, some say it’s the product of some unfortunate soldier in WWII. The tale goes like this: A soldier eagerly opens a letter from his sweetheart. He starts reading to his buddies: “Dear John.” They tell him to go on. “That’s it; that’s all she wrote.” The poor serviceman knows he just got dumped.
It’s an entertaining tale, and plausible enough. The “Dear John” phrase started being used around WWII, and a number of newspapers reference the letters. Some people credit Franklin Roosevelt with originating the phrase, though that’s probably only because he wrote a lot of letters to people named John.
Concrete written records of “that’s all she wrote” start appearing in 1942; one of the first references from the St. Petersburg Times said: “The things that brought tears to their eyes included…the downcast GI about whom another told them ‘He just got a Dear John letter.’”
The source might also have come from a song by the popular singers Aubry Gass and Tex Ritter which had the line “And that’s all she wrote, Dear John”. And the musician Ernest Tubb sang the country song “That’s All She Wrote” with the lyrics: “I got a letter from my mama, just a line or two / She said listen daddy your good girl’s leavin’ you / That’s all she wrote – didn’t write no more / She’d left the gloom a hanging round my front door.”
It’s perhaps not the most cheerful of phrase origins; but the original WWII tale made the phrase stick around to this day.