listen in on sth/sb
— phrasal verb with listen uk /ˈlɪs.ən/ us /ˈlɪs.ən/ verb [ I ]
(Definition of “listen in on sth/sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to touch with your lips, especially as a greeting, or to press your mouth onto another person's mouth in a sexual way