Antonyms for the phrase "ran interference for" could include words like hindered, obstructed, impeded, thwarted, or deterred. They all convey the idea of preventing or slowing down something from happening. Alternatively, you could use variants of the phrase that have a more positive connotation, such as facilitating, assisting, aiding, or supporting. These words suggest that the person is actively trying to make something happen, rather than getting in the way. It's important to choose the right antonym for the context to avoid confusion or miscommunication. Regardless of the specific word choice, it's useful to have a diverse vocabulary to accurately express your thoughts and ideas.