[替角儿 / 替角兒, tì jué rㄊㄧˋ ㄐㄩㄝˊ ㄦ˙] erhua variant of 替角|替角, substitute; sb ready to substitute at any time for principal player; understudy (substitute actor), See Also: 替角
[じかやくろう, jikayakurou] (n) (something that is) available for use at any time; (someone who is) at one's beck and call; (something over which) one has complete mastery