τὸ κοῖλον τοῦ ποδὸς δεῖξαι → show the heels, show a clean pair of heels, show the hollow of the foot, run away
μηνιαίως: Ἐπίρρ. = κατὰ μῆνα, Πάπυρ. Βερολ. 363, 9.