Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
măco, ĕre, 3, v. a. [cf. macellum], to maul, beat, hack: namque nullum Pejus macit homonem quamde mare saevum, Naev. ap. Paul. ex Fest. p. 397 Müll. ad loc.: ut nunc saepe boves lucae ferro male mactae Diffugiunt, Lucr. 5, 1339 Munro ad loc.