A door is a hinged or sliding barrier used to close the entrance to a room, building, or vehicle. Figuratively, a door also means an opportunity or a means of access to something new.
What Does Door Mean?
Door is one of the oldest and most common words in English. It comes from Old English dor and duru, which derived from the Proto-Indo-European root *dhwer- meaning "door" or "gate". This ancient root also produced Latin foris (outside), Greek thyra (door), and Sanskrit dvār. The word has remained largely unchanged for over a thousand years, which shows just how fundamental the concept is to human life.
In its literal sense, a door is the panel — usually of wood or metal — that swings on hinges or slides along a track to open and close an entrance. Buildings have front doors, back doors, and interior doors; cars have passenger doors; lifts have sliding doors. The surrounding structure is called the doorframe, the open gap itself is the doorway, and the step outside is the doorstep.
In its figurative sense, door is used extensively in English to describe opportunities and access. Saying that something "opens the door to" a new possibility is so common that it has become a fixed collocation. Likewise, "closing the door on" something means ending a possibility or refusing to reconsider. These figurative uses appear in business English, academic writing, journalism, and everyday conversation alike.
Example Sentences
| Sentence | Level & usage note |
|---|---|
| Please close the door when you leave the room. | A2 — literal, imperative |
| She knocked on the door and waited for someone to answer. | B1 — literal, narrative past |
| The new trade agreement opened the door to foreign investment. | B1 — figurative collocation |
| The manager left the door open for further negotiations, but no deal was reached. | B2 — figurative, idiomatic |
| Language learning opens the door to new opportunities and connections. | C1 — figurative, formal register |
Collocations
| Collocation | Example |
|---|---|
| open the door | Could you open the door? My hands are full. |
| close / shut the door | He shut the door quietly so as not to wake anyone. |
| lock the door | Always lock the door before you go to bed. |
| knock on the door | Someone is knocking on the door — can you get it? |
| front door | The parcel was left on the front doorstep. |
| back door | We entered through the back door to avoid the crowd. |
| next door | Our neighbours next door have a very friendly dog. |
| open the door to (figurative) | A good degree opens the door to better career prospects. |
| leave the door open (figurative) | The company left the door open for a future partnership. |
| close the door on (figurative) | She closed the door on her past and started afresh. |
Usage Notes
British English Usage
- In British English, door is pronounced /dɔː/ — the final 'r' is silent (non-rhotic). It rhymes with floor, more, and four.
- The compound next door functions as both an adjective and an adverb: "our next-door neighbours" (adjective, hyphenated) vs "they live next door" (adverb, no hyphen).
- Doorway refers to the opening itself; door refers to the panel. You stand in the doorway but you knock on the door.
- The idiomatic phrase open the door to is extremely productive in formal and written English. It collocates with abstract nouns: "open the door to reform", "open the door to abuse", "open the door to dialogue".
- At death's door is a formal idiom meaning very seriously ill or close to dying: "He was at death's door but made a remarkable recovery."
Common Mistakes
Watch Out For
He knocked the door and waited.
He knocked on the door and waited. (use "knock on the door", not "knock the door")
She is standing in the door.
She is standing in the doorway. (use doorway for the open gap in the wall, not door)
Please close the door's handle before leaving.
Please push down the door handle before leaving. (use door handle as a compound noun, without possessive 's)