to take (a position, power, or rights) illegally or by force; to seize and hold in possession without legal authority.

（地位・権力・権利を）不法に（または力ずくで）奪う

to supplant or take over a role, function, or authority (often figurative), especially in a way that displaces the legitimate holder.

（本来の者に代わって）役割・機能・権限を奪い取る（比喩的）