broadseal

from The Collaborative International Dictionary of English v.0.48

Broadseal \Broad"seal`\, v. t.
   To stamp with the broad seal; to make sure; to guarantee or
   warrant. [Obs.]
   [1913 Webster]

         Thy presence broadseals our delights for pure. --B.
                                                  Jonson.
   [1913 Webster]