τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
myrtum: (murtum), i, n., = μύρτον>,
I the fruit of the myrtle, a myrtle-berry: cruenta myrta, Verg. G. 1, 306; cf. Plin. 15, 29, 35, § 118.