To go back is to return to where you were before. Retracing the way you came.
It differs from come back by point of view, since you go back to somewhere away from the speaker. There is a second sense about time, since a friendship that goes back thirty years began then, and going back to a subject means returning to it in conversation. Going back on a promise means breaking it, and that use always carries reproach.
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 3 of A Man Called Ove.
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