(v. t.) To make undue presumptuously claims to; to assume, or claim as one's own, unduly; as to arrogate leadership over a group\.

accroach adopt annex appropriate assume assume command colonize commandeer confiscate conquer encroach enslave expropriate grab hog indent infringe invade jump a claim make free with make use of monopolize mount the throne occupy overrun play God preempt preoccupy prepossess pretend to requisition seize seize power seize the throne sequester sit on squat on subjugate take take all of take charge take command take it all take over take possession of take the helm take the lead take up trespass usurp