at work

prepositional phrase2

1. •
   Working, in the process of doing work.

   • Don't interrupt me while I'm at work on my housing project.
2. •
   (figurative) At play, in action.

   • These three [August Bebel, Helen Stoecker, and Magnus Hirschfeld] can be taken to typify some of the currents at work before the Nazis came to power in 1933. — 1986