Dorothy Dix, n. — Green’s Dictionary of Slang

Dorothy Dix n.

[rhy. sl.; ult. US journalist Dorothy Dix (pseudonym for E.M. Gilmer, 1870–1951), who wrote a popular question-and-answer column]

(Aus. sporting) a six in cricket.

1955		Argus (Melbourne 5 Feb. 3/2: Hutte goes for the bash and with a mighty swipe up into the Dick Fair [...] for a Dorothy Dix.
1982		N. Keesing Lily on the Dustbin 60: One correspondent supplied a list of terms used in family cricket games [...] Dorothy Dix, a six.
2002		Pete’s Aussie Sl. Home Page 🌐 Dorothy Dix: a six, in cricket.