accb69c0-2449-4de1-9759-7b70a5450857
prompter
When is a door not a door?
e2334539-ed9d-40ab-bc2a-03d6701d0fb5
accb69c0-2449-4de1-9759-7b70a5450857
assistant
A door is not a door when it is ajar, or open. When a door is open, it is no longer fulfilling its function as a barrier, and is instead allowing access through an opening.
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e2334539-ed9d-40ab-bc2a-03d6701d0fb5
prompter
how can a door be a jar?
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b4615e26-2d5f-41d1-b839-74636667c763
assistant
If you are asking me how a door can be "ajar" then a door is "ajar" when it is slightly open, leaving an air gap. 

Here are some examples:
The door was ajar.
My email is open and Twitter ajar for your musings.
Turn off the oven and put the cheesecake back in with the door ajar.
The lid had come slightly ajar; the bird was straining at the gap.