Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cambio, īre, v. n. (perf. campsi, acc. to Charis. pp. 219 and 233 P., and Prisc. p. 906 ib.) [whence the Ital. and mercantile cambio, cambiare, cambiatura, etc.; Fr. change, changer, etc.; Engl. change, etc.], to exchange, barter: muto, ἀμείβομαι, Charis. l.l. (post-class. and very rare), App. Mag. p. 284; Sicul. Flacc. Cond. Agr. p. 13 Goes.