γόνασι προσπίπτειν

From LSJ

τὴν πρὶν ἐνεσφρήγισσεν Ἔρως θρασὺς εἰκόνα μορφῆς ἡμετέρης θερμῷ βένθεϊ σῆς κραδίης → the image of my beauty that bold Love earlier stamped in the hot depths of your heart

Source

Greek > English (Woodhouse)

fall at a person's knees