The phrase "entering in" can be synonymous with a variety of phrases that describe the act of beginning or joining something. Other expressions might include "stepping into", "commencing", "starting", "beginning", "joining", "participating in", "taking part in", "becoming involved in", "beginning to engage in", "getting involved with" or "embarking on". These synonyms can help add variety and creativity to writing, allowing individuals to express their thoughts or convey their messages in different ways. By incorporating appropriate synonyms, writers can avoid using the same phrases repeatedly, which can make their writing unique, interesting, and engaging.