Losing one's cool is a common phrase used to describe a situation where someone becomes upset, agitated, or uncontrollable. However, there are many other words and phrases that can be used to convey a similar message. Some examples include, "flying off the handle," "blowing a fuse," "getting worked up," "blowing one's top," "becoming enraged," "losing one's temper," "flipping out," and "having a meltdown." Each of these phrases conveys a similar idea of someone becoming upset or angry and losing control of their emotions. It's always important to stay calm and composed, but when we do lose our cool, it's helpful to have a variety of synonyms to express ourselves accurately.