When you arrogate something, such as a position or privilege, you take it even though you don't have the legal right to it.
When you arraign someone, you make them come to court and answer criminal charges made against them.
Someone who is arrogant thinks very highly of themselves; as a result, they can be overbearing, full of themselves, self-important, and act in a superior fashion towards others.
An arriviste is someone who has recently become socially powerful—usually by dubious means—and is thus regarded as an upstart.
When the police arrest someone, they capture or catch them in order to hold them for questioning.
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