Fr.: écouter de façon indiscrète
To listen secretly to a private conversation.
Probably back-formation from → eavesdropper.
Gušârdan, from gušâr, → eavesdropper, + -dan infinitive suffix.
A person or thing that secretly listens to or monitors the private conversation or data of others.
From M.E. eavesdrop, from O.E. yfesdrype "place around a house where the rainwater drips off the roof," literally "one who stands on the eavesdrop in order to listen to conversations inside the house," from eaves "the lower border of a roof that overhangs the wall" + drip, drop "to fall in small portions."
Fr.: écoute éléctronique
The monitoring and/or examining the data that is passed over the network without sender and receiver's permission and/or knowledge. For example, a user on the Internet could eavesdrop on someone's phone conversation or e-mail.
Noun from → eavesdrop.