First person singular, aorist indicative active, of the epic/poetic verb moge/w, glossed (here and in other lexica) by the corresponding form of moxqe/w. It must be quoted from somewhere; perhaps Homer, Odyssey 12.259, though Latte on Hesychius s.v. cites Iliad 1.162 (which in fact has one of Homer's six instances of mo/ghsa).
See also mu 1179.