The term "lost one's composure" refers to a situation where one's emotions become uncontrollable, leading to a lack of self-control. Some synonyms for this term include "lost it," "flew off the handle," "lost control," "became unhinged," "had a meltdown," and "went ballistic." These terms all imply a similar loss of emotional stability and an inability to manage one's feelings in a controlled manner. In some contexts, alternative phrases such as "lost one's cool," "lost the plot," or "lost one's temper" can also be used to describe a similar situation. Regardless of the terminology used, losing one's composure can have significant negative consequences, especially in social or professional settings.