godan verb (-su)
tamper with; mess with; fiddle with
Colloquial and somewhat negative; implies repeatedly handling, altering, or interfering with something in a meddlesome or careless way. Often used for physical objects, documents, settings, or abstract things like plans.
See also: 捏ね返す
誰かが私の机の上の書類をこねくり返したみたいだ。
It looks like someone messed with the papers on my desk.
I fiddled with the settings too much and can't get them back to normal.
godan verb (-su)
go on endlessly; keep rehashing
Used when someone keeps talking about the same thing, rehashing an argument, or dragging out a discussion without resolution. Often carries a nuance of annoyance or pointlessness.
彼は同じ話をいつまでもこねくり返している。
He keeps rehashing the same story endlessly.
会議で細かい点をこねくり返すだけで、結論が出ない。
They just go on endlessly about minor points in the meeting and never reach a conclusion.