LSJ
fut. ἴψομαι ; aor.1 ἰψάμην : — press hard, oppress, μέγα δ’ ἴψαο λαὸν Ἀχαιῶν Il. 1.454, 16.237; τάχα δ’ ἴψεται υἷας Ἀχαιῶν 2.193; generally, hurt, harm, σὺ τόνδε μηρὸν ἴψω ; Theoc. Adon. 19, cf. Str. 8.6.7; — Act., ἴπτω, = βλάπτω, only in EM 481.3; ἶψαι, ἴψας, Hsch. (Perh. related to ἰάπτω 2 or to ἶπος.)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)