目の上のたんこぶ
  目の上のたん瘤
  めのうえのたんこぶ
  Expressions (phrases, clauses, etc.)
  see: 目の上のこぶ
  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
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