Eaves Dropper is a term used to describe someone who listens in on conversations without the knowledge of the people involved. It is derived from the phrase 'EAVESDROPPING, ' which refers to the act of standing near an open window or door and listening to a conversation taking place inside. The term 'icicle' is often used as a metaphor for eavesdroppers, as icicles hang from the eaves of a house and can be seen from outside.