目の上のたんこぶ
1
a thorn in one's side;a pain in the butt (often someone higher in rank, ability, etc.);a person standing in one's way;a superior who obstructs one's freedom of action
See also:
目の上のこぶ (めのうえのこぶ)
Other forms
目の上のたん瘤 【めのうえのたんこぶ】