work like a Trojan (or Trojans)
Work extremely hard.He works like a Trojan and takes enormous pride in his produce....- He carried on working like a Trojan and kept up a punishing travel schedule that took him to factories all over the Far East, overseeing the manufacture of his shoe designs.
- He tells us that although there has been inactivity on our part, ‘the ground staff have been working like Trojans’.
See parent entry: Trojan