yesterday but one en · ADV
Etymology
From yesterday + but (“except for”) + one https://www.observer.ug/lifestyle/42-entertainment/44856-kataaha-has-to-sort-out-the-cracks-in-english
Meanings
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(dialectal, not-comparable) Day before yesterday.
"Yesterday but one [the day before yesterday], I bought a kilo of beans at 4,000 [shillings]. Yesterday, I came back and it was 5,000."
2020 April 21, “How Uganda’s history of epidemics has prepared it for COVID-19” (4:49 from the start), in PBS NewsHour, Michael Baleke (actor), WETA-TV, via Public Broadcasting Service:"Yesterday but one I located a number of them twisted matches in the floor sweepings of the Slade Arms; an' all that evenin' I sat there, watchin' the different men that came in an' had a drink an' a smoke; but I couldn't get onto no one. …"
1917, William Hope Hodgson, The Mystery of Captain Chappel: