go by

1) PHRASAL VERB If you say that time goes by, you mean that it passes.

[V P] My grandmother was becoming more and more sad and frail as the years went by.

Syn:

go on

2) PHRASAL VERB If you go by something, you use it as a basis for a judgement or action.

[V P n] If they prove that I was wrong, then I'll go by what they say.