[go at it hammer and tongs] {v. phr.}, {informal}
1. To attack or fight with great strength or energy; have a bad argument.
* /Bill slapped George's face and now they're going at it hammer and tongs in back of the house./* /Helen and Mary have been arguing all day, and now they are going at it hammer and tongs again./
2. To start or do something with much strength, energy, or enthusiasm.
* /The farmer had to chop down a tree and he went at it hammer and tongs./* /Charles had a lot of homework to do and he went at it hammer and tongs till bedtime./
Compare: IN EARNEST, WITH MIGHT AND MAIN.