οὔποτε ποιήσεις τὸν καρκίνον ὀρθὰ βαδίζειν → thou shalt never make the crab walk straight
sēmĭ-cŭbĭtālis: e, adj. cubitum,I a half-cubit long: hastile, Liv. 42, 65, 9.
