Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
con-spurco, no perf., ātum, 1, v. a., to defile, pollute (rare): omnia taetro sapore, * Lucr. 6, 22: (juvenem) per vim, Suet. Ner. 35; Col. 8, 3 fin.; Tert. Idol. 1.