Meaning of “go back” in the English Dictionary

"go back" in British English

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go back

phrasal verb with go uk /ɡəʊ/ us /ɡoʊ/ verb present participle going, past tense went, past participle gone

(RETURN)

B1 to return:

That restaurant was terrible - I'm never going back there again.
I'll have to go back for my umbrella.
Do you think you'll ever go back to London?
When do you go back to school?
Let's go back to the beginning and start again.
We can always go back to the original plan if necessary.

More examples

(ORIGIN)

to have existed since a time in the past:

Their relationship goes back to when they were at college together.
Our house goes back to (= has existed since) the 18th century.

(Definition of “go back” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)