Definition
To be 'cool' means to be calm, composed, and relaxed, especially in stressful situations. Think of someone who doesn't panic under pressure, maintaining a level head. 'Cool' suggests an absence of agitation or excitement. It's often associated with being trendy or fashionable, but in this context, it's about emotional control. It's the opposite of being hot-headed or frantic. Imagine a musician effortlessly improvising during a live performance; they are cool.