To hear a conversation one is not intended to hear; to listen in.
To listen for another organism's calls, so as to exploit them.
The act of intentionally hearing a conversation not intended to be heard.
A concealed aperture through which an occupant of a building can surreptitiously listen to people talking at an entrance to the building.
The dripping of rain from the eaves of a house.
The space around a house on which such water drips.