καταπήγνῡμι · katapēgnymi — LSJ
stick fast, plant firmly
stick fast in something, plant firmly, ἔγχος μὲν κατέπηξεν ἐπὶ χθονί Il. 6.213; ἐν δὲ σκόλοπας κ. 7.441, cf. Hdt. 4.72, Ar. Av. 360, PPetr. 3p.121 (iii B. C.), etc.; εἰς τὴν γῆν κ. τὸν καυλόν Arist. HA 555b20; τὸ κέντρον ἐπὶ δένδρον Philum. Ven. 37.1:—Pass., -πᾰγέντος σκόλοπος S.E. P. 1.238, cf. Thphr. HP 3.1.1.
2 fix, crystallize
metaph., fix, crystallize, τὴν χύσιν τῆς ἀπειρίας τῷ περατοειδεῖ δεσμῷ Dam. Pr. 57.
II stand fast, firm in
Pass., with pf. and plpf. Act., stand fast or firm in, ἰὸς ἐν γαίῃ κατέπηκτο Il. 11.378; ἱστὸς -πεπηγώς Hp. Art. 43; στήλη -πεπηγυῖα Hdt. 7.30.
2 become congealed, freeze
become congealed, freeze, Plb. 3.55.5; of fish, ὑπὸ τοῦ ψύχους κ. Arist. HA 601b31.