fellatio
noun [ U ] uk/fəˈleɪ.ʃi.əʊ/ us/fəˈleɪ.ʃi.oʊ/
吮吸阴茎，口交
the sexual activity of sucking or moving the tongue across the penis in order to give pleasure and excitement
Compare: cunnilingus
fellate
verb [ T ] uk/felˈeɪt/ us/ˈfel.eɪt/
为男性口交
to perform fellatio on a man