Changing again and again; being in a state of flux—used for situations that keep shifting.
報道の内容が二転三転して、何が真実かわからない。
The reports kept changing, and I couldn't tell what was true.
計画は二転三転した末に、結局白紙になった。
After many changes, the plan was ultimately scrapped.
交渉は二転三転して、まだ結論が出ていない。
Negotiations have gone back and forth, and no conclusion has been reached yet.
議論が二転三転する中で、最終案がまとまった。
Through much back-and-forth discussion, a final proposal was agreed upon.