What is nick of time?

The phrase "nick of time" refers to a moment that is just in time, or at the precise and most opportune moment. It is commonly used to describe situations where something happens at the last possible moment, just before it would be too late. The origin of the phrase dates back to the 16th century; "nick" refers to a critical point or precise moment. Over time, "nick of time" came to signify a narrow margin or deadline being met at the perfect moment. It's often used in both everyday speech and literature to convey urgency or critical timing.