sidekick
noun [ C ] informal uk/ˈsaɪd.kɪk/ us/ˈsaɪd.kɪk/
助手；随从
a person who works with someone who is more important than they are
I've been his sidekick for long enough - it's time I found myself something better to do. 我给他当助手的时间已经够长了——是该为自己找点儿更好的事做的时候了。
Compare: crony