If you ~ to a private conversation, you secretly listen to it.
He assigned federal agents to ~ on Martin Luther King’s phone calls.
= eavesdrop
PHRASAL VERB: V P to/on n, also V P
If you ~ to a private conversation, you secretly listen to it.
He assigned federal agents to ~ on Martin Luther King’s phone calls.
= eavesdrop
PHRASAL VERB: V P to/on n, also V P
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012