expression, godan verb (-tsu)
gain a bad reputation; fall into ill repute
Used when someone or something becomes the subject of negative rumors or public criticism. The verb 立つ here conveys the idea of a reputation 'arising' or 'spreading'.
あの政治家は汚職事件で悪評が立った。
That politician gained a bad reputation due to a corruption scandal.
一度悪評
Once a bad reputation is established, it's hard to get rid of.