διακναίω · diaknaiō — LSJ
scrape or grate away, ὄψιν δ. gouge out his eye, E. Cyc. 487 (lyr.):—Pass., to be lacerated, Hp. Mul. 2.120; διακναιομένης κάμακος the spear being shivered, A. Ag. 65 (anap.).
wear out, wear away, ἡ ἀσιτίη δ. Hp. Morb. 1.13; πόθος μʼ ἔχει διακναίσας Ar. Ec. 957, cf. E. IA 27 (lyr.), Heracl. 296 (lyr.); δ. Ὀρέστην murder Orestes (i.e. the character, by bad acting), Stratt. 1:—Pass., to be worn quite away, destroyed, αἰκίαις, μόχθοις, A. Pr. 94, 541 (lyr.), cf. E. Med. 164 (lyr.), Alc. 109 (lyr.); πόλις διακναισθήσεται Ar. Pax 251; τὸ χρῶμα διακεκναισμένος with all oneʼs colour scraped off, Id. Nu. 120.