τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
P. and V. πλευρά, ἡ (rare in sing.), Ar. and V. πλεῦρον, τό (rare in sing.).
πλευρά, σταμίν