The phrase "taking the edge off" implies reducing or lessening the intensity or severity of something. The antonym would be to amplify or exacerbate. One could intensify the situation, making it sharper and more distressing, rather than dulling or easing it. Other antonyms for "taking the edge off" could include increasing, escalating, agitating, spiking, or aggravating. These words all imply adding to the existing tension or discomfort, rather than alleviating it. While taking the edge off can be a helpful coping mechanism in certain situations, it's important to recognize when doing so may not be the best course of action.