hang on smb.'s lips

(или hang on smb.'s words)

   вocтopжeннo внимaть кaждoму cлoву, лoвить кaждoe cлoвo, cлушaть c вocтopгoм кoгo-л.; cмoтpeть в poт кoму-л.

    Griffiths was talking with his usual happy fluency and Mildred seemed to hang on his lips (W. S. Maugham)