a cake that is baked on a layer of fruit, then turned before serving so that the fruit is on top.
Origin of upside-down cake
An Americanism dating back to 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for upside-down cake
a sponge cake baked with sliced fruit at the bottom, then inverted before serving
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012