Running interference is a phrase commonly used to describe a situation where someone obstructs or interferes with an opponent's attempts to reach a goal, such as a sports team trying to score. Antonyms for this phrase would include "supporting," "aiding," "assisting," or "encouraging." Instead of obstructing, these words suggest assisting or elevating the efforts of the opposing team. Other antonyms could include "facilitating," "enabling," "clearing the way," or "opening doors." These phrases suggest positive action instead of negative interference, and imply a helpful attitude towards the opponent rather than a hostile one.