[1] = Synagoge alpha864; Photius, Lexicon alpha2583 Theodoridis. The headword as transmitted here is the second person singular imperative, aorist middle, of a)pone/mw (alpha 3453); perhaps however, as noted by Theodoridis, one should adopt the Synagoge ms variant a)po/neimon (quoted from Pindar, Isthmians 2.47: web address 1).
[2] Second person singular imperative, present active, of the same verb; presumably quoted from somewhere.