The Japanese word for cast is
ギプス

gipusu

Japanese Definition

cast
1. 演奏

演奏
1. n. a performance (of music); a recital
演奏時間の短い曲 - literally song with a short playing time
2. v. to play (an instrument)
ピアノを演奏する - play the piano
3. v. to perform (a piece of music)
機械によって自動的に楽曲を演奏すること - playing a musical composition automatically by means of a machine

投げる
1. v. to throw
役者にトマトを投げないでください。 - Please do not throw tomatoes at the performer.
2. v. (Tsugaru Hokkaidō) to throw away
(synonyms, ja, すてる, tr1=suteru, q1=standard Japanese)
3. v. Usage: * (sense, to throw away) Known as a word that dialect speakers unwittingly use as if it were standard language.