A creaking door hangs long on its hinges. (German) A door must either be open or shut. (French) A man does not look behind the door unless he has stood there himself. (Danish) An open door may tempt a saint. (English) Beware of a door that has many...

A door is a panel or barrier, usually hinged, sliding, or electronic, that is used to cover an opening in a wall or partition going into a building or space. A door can be opened to give access and closed more or less securely. The term door is also...