The phrase "raising the roof" typically refers to a loud or enthusiastic celebration, but there are several antonyms that convey the opposite sentiment. Some examples include "lowering the mood," "dampening the spirits," "casting a pall," or "dulling the atmosphere." Additionally, terms like "subduing the excitement," "repressing the enthusiasm," "suppressing the revelry," or "quenching the happiness" can also convey a more muted, subdued feeling. These antonyms may be useful in situations where a more subdued or solemn tone is appropriate, such as during a funeral or a period of mourning.