noun
overstepping one's authority; abuse of power; acting ultra vires
Formal legal or bureaucratic term for exceeding one's official powers or competence. Rare in casual conversation.
その役人の行為は僭上越権にあたると批判された。
The official's actions were criticized as an overstepping of authority.
A yojijukugo (four-character compound) combining 僭上 (presumptuousness, overstepping rank) and 越権 (exceeding authority). The exact historical derivation is uncertain.