Wiktionary
going at it
Etymology 1
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(alternative form of at it English) Etymology 2
v
1 (&lit going at it English) 2 (en-third-person singular of: go at it)
Usage examples of "going at it".
Once a fight of any kind started, every baronial soldier in the tavern would be going at it.
The general let them see one room where they were going at it with all sorts of complicated digging machines, but after that, he just took them down a bunch of side tunnels where no one was doing anything anymore.
When they got going at it hot and heavy, his mother shouted a lot of mostly incoherent accusations.
Maybe going at it the long way around, telling you to think about growing up.
I kept trying to picture the mating that had taken place-two symmetrical but incongruent dogs going at it in two dimensions.