プログレッシブ和英中辞典(第4版)の解説
えっけん【越権】
exceeding one's authority
上司が部下の私生活に口を挟むのは越権だ
Superiors have no right to say anything about the private lives of those under them.
人の収入を調査するなんて越権だ
You 「exceed your authority [overstep yourself] in checking into my income.
越権行為
(an act of) arrogation