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

go by sth

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

to use information about something to help you make a decision about the best thing to do:

You can't go by anything she says.

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