A1
a flat object, often fixed at one edge, that is used to close the entrance of something such as a room or building, or the entrance itself
Dictionary examples:
The cat opened the door himself! (0.0)
I sleep on the door. (0.0)
I cook my dinner on the door. (0.0)
She asked me to answer the door. (20.6)
the front door (25.5)
a car door (28.0)
We could hear someone knocking at/on the door. (29.9)
the back door (31.5)
a sliding door (33.8)
The door to his bedroom was locked. (39.1)
Could you open/close/shut the door, please? (39.9)