I'm looking for (phrasal) verbs that describe these two actions.
Imagine in a music concert, if yor're a guest singer that is invited by the main singer, you're usually going to want to dress less attractive/flashy than the main singer because you don't want to stand out as being more important and draw all the attention to yourself. So is there a verb/phrasal verb that describes "to dress less attractive or make yourself look less attractive", and a verb that describes "to make yourself stand out as being more important than someone else" or "make someone else appear less important/worse than yourself"? I.e.
He is [...] because he doesn't want to [...] the main singer.