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
mātercŭla: ae, f.
dim. mater,
I a little mother (class.): tune igitur mea matercula? Plaut. Fragm. ap. Prisc. p. 601 P.: materculae suae festivus filius, * Cic. Fl. 36, 91; Hor. Ep. 1, 7, 7.