Definition of “close” - Learner’s Dictionary

close

verb [ I, T ] us uk /kləʊz/
Extra Examples
She closed her eyes and fell off to sleep.Just as the door closed he remembered that his keys were inside the room.Make sure that you close all the windows before you leave.It seems that the bars close early here.I understand that the school is due to close next year.
DOOR/WINDOW ETC

A1 If something closes, it moves so that it is not open, and if you close something, you make it move so that it is not open:

Jane closed the window.
Lie down and close your eyes.
Suddenly the door closed.
PUBLIC PLACE

A2 If a shop, restaurant, public place, etc closes, people cannot go in it:

The store closes at 8 p.m.
ORGANIZATION also close down

B2 If a business or organization closes, or if someone or something closes it, it stops operating:

Many factories have closed in the last ten years.
END

B2 to end, or to end something:

She closed the meeting with a short speech.
COMPUTER

If a computer program or a window on a computer screen closes, or if you close it, it stops operating because you tell it to:

This file won't close.

(Definition of “close verb” from the Cambridge Learner's Dictionary © Cambridge University Press)