Synonyms for Arrogate:

n.

arrogate (noun)
claim, take over, usurp, assume, lay claim, seize.

v.

claim without justification (verb)
preempt, usurp, seize, commandeer, assume.
possession (verb)
lay claim, claim.

Other synonyms:

see to. hijack, preempt, move in on. commandeer. handle. take over
usurp.