ἥλιον ἐν λέσχῃ κατεδύσαμεν → we let the sun go down in talk, we let the sun go down in conversation
ἐπιπολαστικῶς: с силой, т. е. шумно (ἐ. καὶ κατακόρως χρῆσθαι τῇ κραυγῇ Polyb.).