In the film On the Waterfront, what key factor ended Terry Malloy's boxing career?

In "On the Waterfront," Terry Malloy's boxing career is significantly impacted by his brother's influence over him. His brother, a member of the corrupt dockworkers' union, pressures Terry to throw a fight, which ultimately leads to his downfall in the boxing world. This manipulation reflects deeper themes of loyalty and the moral dilemmas faced by individuals in a corrupt environment. Instead of winning the fight, Terry loses his chance at a legitimate boxing career due to this pressure, marking a pivotal moment in his life that sets the stage for his later struggles against corruption and his quest for redemption. The drama of familial loyalty versus personal ambition is a central theme throughout the film, making this influence a critical factor in the trajectory of Terry's life.