An old Scottish term, signifying the admission of any person to a trade or burgh, or the money paid for such an admission. “Upset price” of anything is the price at which goods for auction are exposed.
Upset is also the term used in England for the long boards or planks, placed round the sides of the oven, for batch bread, and in front of the loaves, after they are all “set”. The Scottish term for the same appliance is “setter”.
From The Baker’s ABC by John Kirkland, formerly Head Teacher of National School of Baking, published 1927 by Gresham