I checked dictionary.com (not that I don't trust you.)
ar\ufffdro\ufffdgate ( P ) Pronunciation Key (r-gt)
tr.v. ar\ufffdro\ufffdgat\ufffded, ar\ufffdro\ufffdgat\ufffding, ar\ufffdro\ufffdgates
1. To take or claim for oneself without right; appropriate: Presidents who have arrogated the power of Congress to declare war. See Synonyms at appropriate.
2. To ascribe on behalf of another in an unwarranted manner.
I kinda like the example they gave... I said it was OT, didn't I?