The word up-ended means to turn or flip something upside down or to change the position of something so that its top becomes its bottom. The antonyms for up-ended are right-side-up, upright, standing, and vertical. These words indicate a position where the top or head is facing upwards, and the bottom or base is facing downwards. Thesaurus also suggests other antonyms for up-ended such as balanced, level, perpendicular, and straight. These antonyms can come handy in different settings like cooking, gardening, construction, or sports, where orientation is essential. For instance, one might need to ensure that a cake emerges from the oven right-side-up or a building is standing upright.