What is mischievous gleam?

A "mischievous gleam" refers to a twinkle or sparkle in someone's eyes that suggests playfulness, mischief, or a hidden agenda. It often indicates that the person is up to something fun, cheeky, or slightly naughty, evoking a sense of intrigue or amusement. This expression captures the idea of youthful exuberance or a playful spirit, often seen in children or those with a whimsical nature.