Edit
When a character is stepping on another while standing on one leg, walking over them or standing on them, emphasizing that they have dominated the other character who is usually lying on back, on stomach or on all fours. This is often a femdom / BDSM practice but the tag can be used with any gender combination.
Do not use this tag if the character is sitting. Tag with stepped on or sitting on person instead. If the main focus of the image is the character being trampled, tag with steppee focus. If the steppee is sitting, kneeling or standing, it could be foot worship instead of trampling.
Do not use this tag if a girl is just giving a footjob while standing on one leg like post #9655129, crotch stomping (post #5731833) or performing a denki anma (post #8707473) because these situations are more common than trampling. Same for female footjob (post #1156168). But you can use this tag with a footjob in other situations like post #3755871 (no foot on the floor, so it can be tagged standing on person) and post #2676901 (through ground).
Examples
trampling a robot
giantess trampling
Non-Examples
standing on person but it's not trampling
stomping viewer: Nobody is being stepped on but a character raised her leg to stomp someone
