door · noun C /dɔːr/Full view
door
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 front door

the back door

a car door

a sliding door

The door to his bedroom was locked.

We could hear someone knocking at/on the door.

Could you open/close/shut the door, please?

She asked me to answer the door.

Learner example:

There is a garden [outside the] back door but [it] isn't big. (Skills for Life (Entry 1); A1; Thai)

behind closed doors
C2 privately and not in public
Dictionary example:

Most of the deals were made behind closed doors.

Learner example:

Decisions which affect the whole world are made behind closed doors and are top secret. (Certificate of Proficiency in English; C2; Russian)

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