"Misdemean oneself" refers to acting in a manner that is inappropriate or unacceptable, especially in public settings. Synonyms for this phrase include behaving in a manner that is unbecoming, acting inappropriately, misbehaving, being unruly, breaking the rules, being disorderly, causing a disturbance, making a scene, displaying bad manners, and behaving disgracefully. These phrases all imply actions that fall short of expected standards of behavior and can result in negative consequences such as embarrassment, shame, and possible legal repercussions. It is important to strive to maintain proper conduct and treat others with respect, regardless of the situation or circumstances.