The phrase "step on" has various synonyms that can be used in different contexts. One alternative term is "trample," which means to crush or injure something or someone by treading heavily. Another similar term is "stomp," which implies a forceful and deliberate action of stepping down. "Tread on," is also a synonym of "step on," which refers to walking on top of something. Additionally, "crush," "mash," and "flatten" can be used to describe the act of stepping on something with force or pressure. However, it is important to note that these words can also have different meanings depending on the context in which they are used.