device, most commonly a hidden microphone
or other concealed listening device (piezo sensors, for example), is also referred to as a bug
. This may stem from the concept of being a fly on the wall
, or the notion that an concealed listening device was like a bug, unwanted and hiding.
: tap a telephone or telegraph wire to get information; "The
FBI was tapping the phone line of the suspected spy"; "Is
this hotel room bugged?" syn: wiretap, tap, intercept