What does it mean to "subside"?

The term "subside" refers to the process of something settling down, descending, or becoming less intense or active. In a physical context, it can describe a situation where a structure, such as land or a building, gradually sinks or lowers. In a metaphorical context, it can indicate a calming of emotions or a reduction in intensity, such as the way a storm might subside or anger may fade.

This understanding aligns perfectly with the definition provided in the chosen answer. The other options suggest actions that either increase or block, which are contrary to the essence of "subside," as it inherently implies a decrease in height, intensity, or noise.