Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prae-sāgus, a, um, adj., foreboding, foretelling, divining, prophetic, presaging (poet. and in post-Aug. prose): praesaga mali mens, Verg. A. 10, 843: fulminis ignes, id. ib. 177: luctus suspiria, Ov. M. 2, 124: verba, id. ib. 3, 514: ars, Val. Fl. 5, 434: astra, Stat. Th. 8, 145: responsa, Tac. H. 2, 1: nares, Firm. Math. 8, 9: somnium praesagum futurorum, Vulg. Gen. 41, 11.