τὸν ἀπὸ γραμμᾶς κινεῖν λίθον → move one's man from this line, move a piece from this line, try one's last chance, make a last ditch effort
ἀμφίδρυφος, -ον (Α)ο αμφιδρυφής.[ΕΤΥΜΟΛΟΓΙΑ < ἀμφι- + -δρυφος < αρχ. δρύτττω «σχίζω»].