suru verb (special), transitive verb
usurp boastfully; arrogate to oneself
Rare, literary term for seizing a position or title with arrogant self-importance. Found mainly in historical or formal texts.
彼は王位を僭するような真似をした。
He acted as if he would arrogate the throne to himself.
古典
In classical literature, criticism of those who usurp power is depicted.