1 general:: Phrase(s): go to it 1. Lit. to start something actively; to do something with vigor. • Time to play ball. go to it! • Let’s go to it, you guys! 2. Inf. to fight. • Come on, let’s go to it! I’m gonna beat the daylights out of you!
McGrawhill's American Idioms And Phrasal Verbs
2 general:: see GO TO, def. 3.
American Heritage Idioms