The Laowai's Unofficial Chengyu Guide
Enter characters (九牛一毛), pinyin (jiu niu yi mao or jiǔ niú yī máo), or English idioms (such as "a drop in the sea")
Just browsing? You can check out a filterable list of all the chengyu entries here, a list of all old HSK 6 chengyu here, or a list of entries organized by time period here