τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
subs.
P. προπέτεια, ἡ, θρασύτης, ἡ, εὐχέρεια, ἡ, P. and V. ἀβουλία, ἡ, θράσος, τό, τόλμα, ἡ, ἀφροσύνη, ἡ, Ar. and V. δυσβουλία, ἡ; see rashness.