Definition:
The phrase “out of sight” can be used in two main ways: as an adjective and as an adverb.
In a more figurative sense, "out of sight" can also refer to something that is extremely impressive or excellent, often used in informal contexts. - Example: "The concert was out of sight! I loved every moment!"
While "out of sight" primarily refers to something not being seen, it can also imply something is so good that it is beyond normal expectations.