The phrase "man-on-man" is commonly used to describe a specific type of competition or conflict involving two individuals who are both male. However, the language we use constantly evolves and it's important to consider alternative synonyms for this phrase. One possible term that could be used as a substitute is "one-on-one", which implies a direct interaction between two people regardless of their gender. Another possible synonym could be "head-to-head", emphasizing the direct confrontation between two individuals. It's essential to be mindful of inclusive language when discussing such situations, as it promotes equality and avoids reinforcing gender stereotypes.