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Related to think back: reminisce
To recall; to think about someone or something in the past. Often followed by "on (someone or something)" or "to (something)." It's a little bittersweet to think back to that time in my life when I was so young and carefree. Thinking back on my family growing up, I realize how close my siblings and I once were.
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.
(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.
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.