Definition of go (to) it in English:

go (to) it

phrase

British
informal
  • Act in an energetic or dissipated way.

    ‘Go it, Dad! Give him what for!’
    • ‘And, as if two books in a matter of months wasn't going it just a bit, her new novella, Beasts, is being published by Orion in March.’
    • ‘You've got your missions. Go to it.’