deixar pra lá, não ligar
Definition: to not react or say anything about some annoying or stupid behaviour.
(This is not a phrasal verb, but has more than one meaning)
E.g.1: It was a stupid thing to say, but he let it go and concentrated on the television.
E.g.2: Let it go, John. He didn't mean to insult you.
This phrase can be separated.
Fonte: Knights English