Baker's Units Revisited
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onA few years ago on cohost, I (re)invented the idea of applying "baker's" to any quantity to refer to one more of that quantity. A baker's dozen is 13, a baker's half-dozen is 7, a baker's score is 21, etc. The etymology of the phrase mentions adding a 13th loaf of bread when selling a dozen, to be on the safe side. This "rounding up to one more" could be applied to any quantity, so I'm surely not the first person to consider it.
Last night, I was imagining applying the opposite of the "baker's" prefix, to indcate one fewer of a given quantity. I had originally come up with "swindler's," but my friend mentioned that it wasn't specific enough of a profession. To keep with the idea of "skimming one off the top" and to minimize the Levenshtein distance between the prefixes, I proposed "banker's." A banker's dozen is 11, a banker's half-dozen is 5, a banker's score is 19, etc.
It turns out that banker's dozen is already a phrase in Australian English, which may just push me personally from "fun in-joke" to "actually adopting and spreading the phrase whenever possible."