hold forth on/about (something)
to speak in public, to talk about something
My boss was holding forth about taxes last night when I saw him in his office.
Top Sports Rivalries of All Time
Detroit Pistons vs Chicago Bulls
The Detroit Pistons and the Chicago Bulls had a rivalry for Eastern Conference superiority in the late 1980s and early 1990s and it was a truly epic one for multiple accounts. In the early years of the rivalry, the Bad Boys from Detroit had their way with the imposition of the Jordan Rules. Those rules were Detroit s philosophy designed by head coach Chuck Daly to make the other Bulls besides Michael Jordan take the most important shots of the game.