listen in
US /ˈlɪs.ən ɪn/
UK /ˈlɪs.ən ɪn/
1.
écouter aux portes, surveiller
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.
J'ai surpris ma sœur en train d'essayer de surveiller mon appel téléphonique.
•
The neighbors often listen in on our conversations.
Les voisins écoutent souvent nos conversations.