The antonyms for "more stand out" include "blend in," "conform," "assimilate," "camouflage," and "disappear into the crowd." When something or someone stands out, it means that they are noticeable, different, and unique. Conversely, to blend in is to fit in or become part of the crowd, while conforming denotes adhering to the norms and expectations of society. Assimilation implies becoming part of a culture and adopting its practices and beliefs, while camouflage means hiding or masking oneself. Finally, to disappear into the crowd means to become unnoticed and indistinguishable from others. Therefore, the opposites of "more stand out" can connote a lack of individuality, conformity, or invisibility.