go backphrasal verb
Definition of go back
1 : to return to a place I forgot my purse and had to go back for it. After college she went back home. Go back inside! You'll catch cold.
2 : to return to doing something I turned off the alarm and went back to sleep. He waved hello, then went right back to work. She went back to eating her dinner.
3 : to have existed for a particular amount of time or since a particular period These ruins go back hundreds of years.
4 : to have known each other for an amount of time We go back 30 years. He and I go back a long way.
5 : to think or talk about something from the past To fully understand the issues, we have to go back a few years.