He will stand in as the acting manager.

他会代替出任代理经理的职务。

youdao

I'm acting as deputy till the manager returns.

我在经理回来之前代行他的职务。

《牛津词典》

The engineering manager Francis had come a long way - once a habitual micromanager, he was now acting like much more of a mentor and coach for the Team.

工程经理Francis有了很大的改进-他曾是名习惯性的微管理者，他现在更像是团队的导师和教练。

youdao

Acting manager Mark Challis said Belfast Zoo was establishing an excellent reputation for the breeding of leaf eating monkeys.

BBC: NEWS | UK | Northern Ireland | Zoo celebrates rare monkey birth

Michael Gilbert, then acting lifer manager at North Sea Camp, reported that Houchin remained "in denial" and his continued presence at the open prison was "untenable".

BBC: Killer Alan Houchin's compensation claim blocked by judge

At work, "I have the opportunity to learn something new every day" by listening to doctors and pharmacists, says Ms. Taylor, 50, who has been promoted to acting nurse manager.

WSJ: People Who Never Miss a Day of Work