Regular coming and going; commuting or attending on a regular basis (e.g., commuting to work/school or regular visits).
毎日電車通いで会社まで片道一時間かかる。
I commute by train every day; it takes an hour one way to the company.
彼は実家通いで大学に通っているので下宿はしていない。
He commutes from his parents' home to university, so he doesn't board at school.
病院通いが続いているが、治療は順調だ。
I've been making regular hospital visits, but the treatment is progressing well.