目の上のたんこぶ、目の上のたん瘤
めのうえのたんこぶ
menouenotankobu
JMdict entry #2153150
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expressions (phrases, clauses, etc.)
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: 目の上のこぶ