listen in

US /ˈlɪs.ən ɪn/
UK /ˈlɪs.ən ɪn/
"listen in" picture
1.

يتنصت, يستمع خلسة

to listen to a private conversation between other people, without them knowing that you are listening

:
I caught my sister trying to listen in on my phone call.
لقد أمسكت أختي وهي تحاول التنصت على مكالمتي الهاتفية.
The neighbors often listen in on our conversations.
الجيران غالبًا ما يتنصتون على محادثاتنا.