go at someone/something
— phrasal verb with go us/ɡoʊ/verb present tense goes, present participle going, past tense went /went/, past participle gone /ɡɔn, ɡɑn/
to attack someone or something violently, using either force or very strong language:
The candidates went at each other during the debate.
To go at something is also to use all of your energy and effort to succeed:
The crowd showed up to see the two golfers go at it the final day of the tournament.