go back phrasal verb ( see also ↑ go )
1 . to return to a place that you have just come from:
I think we ought to go back now.
go back to/into/inside etc
I felt so sick I just wanted to go back to bed.
go back for
I had to go back for my passport (=to get my passport) .
2 . there’s no going back spoken used to say that you cannot make a situation the same as it was before:
I realized that once the baby was born there would be no going back.
3 . [always + adverb/preposition] to have been made, built, or started at some time in the past:
It’s a tradition that goes back at least 100 years.
go back to
The building goes back to Roman times.
4 . if people go back a particular length of time, they have known each other for that length of time:
Peter and I go back 25 years.
We go back a long way (=we have been friends for a long time) .
5 . to think about a particular time in the past or something that someone said before:
If you go back 20 years, most people didn’t own a computer.
go back to
I’d like to go back to the point that was made earlier.