Merriam-Webster's Collegiate® Dictionary, 11th Edition
BRANDISH
I. transitive verb
Etymology: Middle English braundisshen, from Anglo-French brandiss-, stem of brandir, from brant, braund sword, of Germanic origin; akin to Old English brand
Date: 14th century
to shake or wave (as a weapon) menacingly, to exhibit in an ostentatious or aggressive manner, see: swing
II. noun
Date: 1599
an act or instance of brandishing