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go back

part of speech: phrase
definition 1: to return to a place, person, topic of discussion, or activity previously engaged in.
We went back to the hotel to get our jackets.No one was surprised when he went back to his old girlfriend.That's true, but I'd like to go back to what I was saying before.After a year abroad, he went back to working for his father at the store.I tried but I couldn't to go back to sleep.
definition 2: to have existed for a certain amount of time or since a time in the past.
Our business relationship goes back fifty years.This war ship goes back to the seventeenth century.
definition 3: to be acquainted for a certain period of time.
She's an old friend--we go back over twenty years.