overthrow (http://definr.com/overthrow)

     n 1: the termination of a ruler or institution (especially by
     2: the act of disturbing the mind or body; "his carelessness
        could have caused an ecological upset"; "she was
        unprepared for this sudden overthrow of their normal way
        of living" [syn: upset, derangement]
     v 1: cause the downfall of; of rulers; "The Czar was overthrown";
          "subvert the ruling class" [syn: subvert, overturn,
          bring down]
     2: rule against; "The Republicans were overruled when the House
        voted on the bill" [syn: overrule, overturn, override,