Origin: 1600–10; < Latin castīgātus literally, driven to be faultless (past participle of castigāre to chasten), equivalent to cast(us) pure, chaste + -īg-, combining form of agere to drive, incite + -ātus-ate1
1607, from L. castigatus pp. of castigare "to purify, chastise," from castus "pure" (see caste) + agere "to do." Sense of "make someone pure by correcting or reproving him."