Put a cup on a door to amplify the sound from inside the room. Has to be glass. Or you can put your head to the wall or door. Sometimes you can put your ear against a pipe that is connected to pipes in the next room.
"Listen in" is a synonym for eavesdrop.
Eavesdrop - film - was created in 2008.
The duration of Eavesdrop - film - is 1.5 hours.
Eavesdrop - 2008 was released on: USA: 2008
To eavesdrop is to secretly listen in on a private conversation.It is ethically improper to eavesdrop.When you eavesdrop you might not like what you hear.
Beeswop.
no
Eavesdrop
he was eavesdroping on me
Snoop
To eavesdrop it to surreptitiously overhear a private conversation. To listen is to hear and pay attention openly and with the speakers knowledge.
snoop, spy, monitor, overhear