τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
subs.
P. and V. ἅρμα, τό, V. δίφρος, ὁ (also Plat., Criti. 119B, but rare P.), ὄχημα, τό, ὄχος, ὁ, ἀπήνη, ἡ; see chariot.