the.com/eavesdropper

Someone who mistakes other people's conversations for public radio.

means Someone who secretly listens in on a private conversation they weren't meant to hear.

from Rooted in 'eavesdrop,' the ground where rainwater drips off the eaves of a roof. In old English law, an 'eavesdropper' was literally someone who stood in that narrow strip of dripping ground, pressed close to a house's walls, to listen through windows or cracks to what was said inside. The crime was named for the criminal's chosen spot — lurking exactly where the roof's edge would soak you, just to catch a stray word.

origin
Named for standing under roof eaves to overhear
legal term
Eavesdrop meant trespassing within eave's drip line
modern form
Now mostly done through smart speakers, not walls
irony
The device you trust records what you whisper
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