"Congress's arrogated powers over domains hitherto belonging to the states"
同义词：assumed
V-T/V-I（及物动词/不及物动词） If someone arrogates to themselves something such as a responsibility or privilege, they claim or take it even though they have no right to do so. 妄取 [正式]
The assembly arrogated to itself the right to make changes.
议会攫取了进行修改的权利。