Eavesdrop definition

To hear a conversation one is not intended to hear; to listen in.

I hope nobody was eavesdropping on our conversation last night, since it got so personal.

To eavesdrop usually implies the listener is purposefully trying to hear the conversation of others. To is more often accidental.

The dripping of rain from the eaves of a house
The space around a house on which such water drips
A concealed aperture through which an occupant of a building can surreptitiously listen to people talking at an entrance to the building