眼中钉

Explanation: Analogy in mind the most offensive and most hated people. 　　Source: "New History of the Five Dynasties Zhao Li-chuan" in the ceremony in Song, in particular suffering of people. Yier stop to, but with that said, Songren Xi 'eyes of the nail, it not Le zai? '" Thesaurus:  a thorn in sb's flesh [side]