The Collaborative International Dictionary
Broadseal
Broadseal \Broad"seal`\, v. t. To stamp with the broad seal; to make sure; to guarantee or warrant. [Obs.]
Thy presence broadseals our delights for pure.
--B.
Jonson.
Wiktionary
broadseal
vb. (context obsolete rare transitive English) To stamp with the broad seal; to make sure; to guarantee or warrant.