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Listen In (Verb)

Listen without the speaker's knowledge; "the jealous man was eavesdropping on his wife's conversations".

Verbs of seeing, hearing, feeling.

She claimed to have accidentally picked up the receiver while her brother was on a phone call, but in reality she had chosen to listen in on his conversation.
Her curiosity got the better of her, and she began to listen in on her roommate's hushed conversations.
Police detectives could listen in on suspected terrorist communications without alerting them to their investigation.
As the neighbor's conversation through the thin wall turned heated, she tried to stop herself from continuing to listen in.
Parents might feel compelled to listen in on their teenager's phone calls to gauge their safety and well-being.

Listen quietly, without contributing to the conversation.

Verbs of seeing, hearing, feeling.

She decided to listen in on the meeting and observe the discussion without interrupting.
A quiet student in the back of the classroom would often listen in to the debates without contributing.
Let's listen in on the neighbors' conversation for a bit, it sounds interesting.
He found a seat in the corner and chose to listen in to the conversation, gathering as much information as he could.
The researcher asked permission to listen in on the focus group discussion to get a better understanding of the opinions.