Adjective: A short distance away or apart in space or time.
Adverb: In a position so as to be very near to someone or something; with very little space between.
Verb: Move or cause to move so as to cover an opening.
Noun: The end of an event or of a period of time or activity.
Whether you are close or far, when someone close to you closes the door on you, you have to give closure to that.
No matter how much you would like that door to remain open.