deputize
verb [ I ] (UK usually deputise) uk/ˈdep.jə.taɪz/ us/ˈdep.jə.taɪz/
（尤指工作上）代理…;替…发言
to act or speak for another person, especially at work
I'm deputizing for (= doing the job of) the director during his absence. 主任不在期间由我代理他的工作。