From the film of Monty python and the holy grail.
The knights who say ni!
ARTHUR: Who are you?
HEAD KNIGHT: We are the Knights Who Say... 'Ni'!
ARTHUR: No! Not the Knights Who Say 'Ni'!
When something that can be said to be closeable is closed MOST of the way but not all. Such as when a door is just barely opened.
You didn't close the door all the way, it was just closed over.