thwart


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

     n : a crosspiece spreading the gunnels of a boat; used as a seat
         in a rowboat [syn: cross thwart]
     v 1: hinder or prevent (the efforts, plans, or desires) of; "What
          ultimately frustrated every challenger was Ruth's
          amazing September surge"; "foil your opponent" [syn: queer,
           spoil, scotch, foil, cross, frustrate, baffle,
           bilk]
     2: hinder or prevent (the efforts, plans, or desires) of [syn:
        frustrate, spoil]