Set to work on them - Idioms by The Free Dictionary
set to work on (someone) (redirected from set to work on them)
set to work on (someone)
To begin doing something to someone. Mom set to work on me and bandaged my scraped knee.
go/set to ˈwork (on something) (also get (down) to ˈwork (on something)) start working on a particular task: I set to work on the car, giving it a good clean. ♢ I ought to get to work on that report.