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| Subject | English | Russian |
| intell. | listen in on | прослушивать (World leaders usually have various people listening in on their conversations, including aides and interpreters. 4uzhoj) |
| tech. | listen in on a line | подключаться к линии для контрольного подслушивания |
| amer. | listen in on the conversation | прислушиваться к разговору (Val_Ships) |