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Related to think back: reminisce
(on someone or something) to remember and think about someone or something. When I think back on Sally and the good times we had together, I get very sad. I like to think back on my childhood and try to remember what it was like.
think back (to something)
to remember back to something in the past. Now, try and think back to the night of January 16. I can't think back. My mind is preoccupied with other things.
to remember something When I think back on it, I realize I should have noticed that you were unhappy. Melissa and Jay both fell silent, thinking back to the dreadful time when Jack had almost died.
Recall or reflect on, as in When I think back on my days as a summer camper, I really had a good time, or As he thought back to his father, long dead, tears came to his eyes. [Mid-1900s]
To consider or think about the past; recollect: Think back to that time we went to the zoo. I thought back on all the the things we've done for the company.