1709, "put aside, rejected," from verbal phrase cast off "discard, reject" (c. 1400), from cast (v.) + off (adv.). From 1741 as a noun, "person or thing abandoned as worthless or useless." Related" Cast-offs.
wearing someone's cast-off clothes
castigation
Castile
casting
cast-iron
castle
cast-off
castor
Castor
castrate
castrati
castration