Drop The Gloves Meaning

(Canada and US, idiomatic, by extension) To remove a prior impediment to action; to prepare for or engage in a dispute.

Example: 2007 March 27, Mike Brophy, "Getting rid of the goons," Globe and Mail (Canada) (retrieved 14 Oct 2008):
  Nobody used to care when players such as John Ferguson, Bobby Orr, Gordie Howe and Maurice Richard dropped the gloves, because they could play the game, too.
2000 Jan. 30, Thomas DeFrank et al., "George W. & Al Bank on Bubba," New York Daily News (retrieved 14 Oct 2008):
  But Bradley, who dropped the gloves on Gore in a combative debate Wednesday night and called the vice president chronically dishonest, ignored Sullivan's advice.