a flat, movable barrier of wood, glass or metal that can be opened or close and forms the entrance to a building, room, or vehicle
Please close the door. It’s very cold outside!

in a lower position or part of something
They fly up and down!

arriving, happening or beginning after the expected time
She's late for work every day. She is lazy.

outside or at a distance
Billy runs out of the house.

the seventh day of the week and the last day of the weekend, following Saturday and preceding Monday
On sunday I sleep a lot.

the day that is occurring now
today, it has more than 18,000 sponsors.