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
συνωμότις: -ιδος, θηλ. τοῦ συνωμότης, Νικήτ. Χρον. 340D.