adverb, noun or participle which takes 'suru'
this and that; one thing or another
Used when referring vaguely to various things or matters, often in the context of doing or dealing with them. Can be used adverbially or with する.
そうこうしているうちに、時間が過ぎてしまった。
While I was doing this and that, time passed.
そうこうするうちに、電車が出てしまった。
While I was dealing with one thing or another, the train left.