If you are ~ with someone, you are talking privately to them. (FORMAL or LITERARY)
Charles and I were ~ in his study for the briefing session.
ADJ: v-link ADJ, usu ADJ with/in n
If you are ~ with someone, you are talking privately to them. (FORMAL or LITERARY)
Charles and I were ~ in his study for the briefing session.
ADJ: v-link ADJ, usu ADJ with/in n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012