Antonyms for "take edge off" could include phrases such as "spike up," "intensify," or "heighten." These suggest a deliberate increase in something, such as the level of excitement or anticipation. Other antonyms might include "amplify," "exacerbate," or "worsen," which convey a more negative connotation of making a situation worse. Overall, the antonyms for "take edge off" are words and phrases that suggest an increase in tension, emotion or severity, rather than a decrease, which is what the original phrase entails. It is important to use the appropriate antonyms depending on the context and the intended meaning of the sentence.