The phrase "making waves" typically refers to creating a stir or causing trouble. However, there are many antonyms that represent the opposite of this phrase. Some of the most common antonyms include phrases like "staying quiet," "avoiding conflict," and "keeping out of trouble." These antonyms imply a sense of calm and avoiding danger or attention, which is the opposite of making waves. Other antonyms for the phrase could include "lying low," "flying under the radar," or "keeping a low profile." All of these phrases emphasize the importance of staying out of the spotlight and avoiding any sort of controversy.