From Longman Dictionary of Contemporary Englishthink back phrasal verbREMEMBERto think about things that happened in the past Thinking back, it amazes me how we survived on so little sleep. to/over/on He thought back to the day he’d first met Sophie. → think→ See Verb table
Examples from the Corpus
think back• This telephone call made me think back over the years.• I was thinking back to famous historical sound bites.• She thought back to his anger last night.• I sometimes think back to that first talk I did in Mr Taylor's class, and how scared I was.• As he watched Myeloski eat, he thought back to the incident of the failed thrust-reverser.• Now, think back to the Q and A portion of the pageant: Remember the finalists' answers?• But think back to the stories in this book as well as your experience.• Young overthrew a receiver in the first quarter, and you had to think back to when he did that last. 