From his hotel room, Mr. Serani can roll a robot up to an office cubicle back at headquarters, listen in on a telephone sales pitch and offer advice.
He assigned federal agents to listen in on Martin Luther King's phone calls.
She likes to listen in on other's private conversation.
Do you listen in on God's council?
You shouldn't listen in on other people's conversations.
We were allowed to listen in on a lively lecture on how top-down management systems don't often work.
How dare you pick up the phone and listen in on my conversations!
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