be working overtime

be working overtime

If someone or something is working overtime, they are working very hard in order to achieve something. The team had been working overtime to improve the party's image. People need more sleep when their immune mechanisms are working overtime to fight off infections. Note: The literal meaning of this expression is that someone is spending extra time doing the job that they are employed to do.
See also: overtime, working

be working ˈovertime

(informal) be very active or too active: There was nothing to worry about. It was just her imagination working overtime.
See also: overtime, working