phrasal
1.
a. : to make an attack on
picking up a chair … and going at her with smashing blows — Glenway Wescott
b. : to make an approach to
not every succeeding critic has gone at the book in this general fashion — R.R.Von Abele
2. : to engage in vigorously or energetically : undertake
curious to know for what … reason we have gone at organizing with such abandoned enthusiasm — C.W.Ferguson