This is the 10097th most frequent Japanese word.
遡
"遡" means "to go upstream" or "to trace back (in time or a sequence)."
遡って (sakatte) describes the action of tracing or going back in time or sequence.
彼の話を遡って過去の出来事を調査しました。
We traced back his story to investigate past events.
遡って (sakatte) is used here to denote moving or traveling upstream against the flow of a river.
川を遡って魚を探しました。
We went upstream along the river to look for fish.
遡って (sakatte) conveys reviewing or studying events from the past or backward in chronological order.