The phrase "ancient feud" refers to a long-standing disagreement or conflict between two groups or families that has been going on for a significant amount of time. Full definition
The film traces the beginnings of the ancient feud between the two tribes as Selene (Kate Beckinsale) and Michael (Scott Speedman), the lycan hybrid, try to discover the secrets of their bloodlines. (lightviews.com)
Sam Witwicky (Shia LaBeouf) thinks he's headed for college, but instead he finds himself — once again — caught in the middle of the ancient feud between the Autobots and the evil Decepticons. (parentpreviews.com)