Questions & Answers about Pod dveřmi je průvan.
Because Czech dveře is a plural-only noun. Even when English says door, Czech usually uses the grammatically plural word dveře.
So:
- dveře = a door / doors
- dveřmi = by/with/under the door, in the instrumental plural
This is normal Czech, not a special meaning. So pod dveřmi still means under the door, not necessarily under the doors.
Dveřmi is instrumental plural.
The preposition pod can take different cases depending on meaning:
- pod + instrumental = location, under/below
- pod + accusative = movement to a position under something
Here the sentence describes a location, not movement, so Czech uses the instrumental:
- Pod dveřmi je průvan. = The draft is under the door / There is a draft under the door.