When something "puts a damper on" a situation, it means that it decreases the enjoyment or success of it. Therefore, antonyms for this phrase would be anything that enhances or improves a situation. For instance, "brightens up," "lifts up," "enlivens," and "spices up" are all possible antonyms for "puts a damper on." Alternatively, "gives a boost to," "stimulates," "invigorates," and "reinvigorates" can also be used as antonyms for this phrase. Using these words would help shift the focus from negativity to positivity and excitement, which can improve the overall feeling of any situation.