The phrase "trampling up on" can be replaced with a variety of synonyms depending on the context and the intended meaning. Some possible alternatives include "stomping on," "marching over," "crushing underfoot," "violating," "trespassing," "infringing upon," "overrunning," "disregarding," and "neglecting." Each of these synonyms conveys a slightly different nuance and emotional tone, so it's important to choose the word that best fits the situation and the writer's intended message. Overall, synonyms for "trampling up on" can help diversify and enrich a writer's vocabulary while adding depth and clarity to their writing.