Lose one's head is a phrase that is used to describe a sudden loss of control due to overwhelming emotions. The idiomatic expression can be used to describe different scenarios like losing one's temper, losing one's cool, or losing one's nerve. Other synonyms for lose one's head can be found in phrases like going crazy, acting irrationally, freaking out, or panicking. In some cases, losing one's head can also mean making reckless decisions or acting impulsively. Regardless of the context, losing one's head usually involves a negative outcome, and it's always important to manage emotions and stay level-headed when faced with challenging situations.