τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
v. trans.
Cripple: Ar. and P. πηροῦν. Injure: P. and V. βλάπτειν, κακοῦν, διαφθείρειν, λυμαίνεσθαι, λωβᾶσθαι (Plat.), αἰκίζεσθαι.