Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dēcharmĭdo, āre, 1, v. a. [de-Charmides], to un-Charmidize, i. e. to destroy one’s identity as Charmides, also (with allusion to etym. of Charmides, "Son of joy," from χάρμα) to end his happiness: rursumte decharmida, Plaut. Trin. 4, 2, 135.