Meaning of “go at sth” - Learner’s Dictionary

go at sth

informal phrasal verb with go us uk /ɡəʊ/ verb [ I ] present participle going, past tense went, past participle gone

to start doing something with a lot of energy and enthusiasm:

There were a lot of dishes to wash so we went at it straight away.

(Definition of “go at sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)