τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
from an unused root meaning to buy; price, payment, wages: gain, hire, price, sold, worth.
the same as מְחִיר; price; Mechir, an Israelite: Mehir.