A knack is a natural talent or skill that someone has for doing something.
You know how some people can fix a car with ease or cook up a storm? They've got a knack for it. The word "knack" usually refers to an ability or skill that comes easily, like second nature. It's not necessarily something you learn in school or practice every day, but rather something you have a natural gift for.
For example, if someone says "She's got a knack for photography", they mean she has a special talent for taking great pictures. Maybe it's the way she arranges light and shadow, or the way she captures emotions on camera. Whatever it is, her photos just seem to pop with life.
A readiness in performance; aptness at doing something.
To crack; to make a sharp, abrupt noise; to chink.
