To seize and hold (the power or rights of another, for example) by force or without legal authority. See Synonyms at appropriate. (verb-transitive)
To take over or occupy without right: usurp a neighbor's land. (verb-transitive)
To take the place of (another) without legal authority; supplant. (verb-transitive)
To seize another's place, authority, or possession wrongfully. (verb-intransitive)
Examples of word usurp
But she used the magic word usurp, which is always big ...
I wondered who the skinny Black guy was trying to 'usurp' my candidate's position, then I heard him speak.
At the weekly news conference in Moscow, a Russian foreign-ministry spokesman said neighboring countries were free to choose alliances and denied Moscow was attempting to "usurp" other nations 'international rights.
For extending deadlines and allowing hand recounts, Bush accused the Florida Supreme Court of trying to "usurp" the legislature's power.
So they clearly know in the Obama campaign that he's been able to kind of usurp that mantle and bring change and the maverick thing.