Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ē-mūto, no perf., ātum, 1, v. a., to change, alter (perh. only in the foll. passages; cf.: muto, immuto, commuto), Manil. 5, 149: emutatis in perversum dicendi figuras, Quint. 8, 2, 19.