The phrase "cool of the day" can be used to describe a pleasant time during a hot day. There are numerous synonyms that can capture the same idea. Some of these synonyms include "dusk," "twilight," "sunset," "evening," and "nightfall." Each of these words can be used to describe the period of time during a summer day when the heat has subsided and the weather is more comfortable. Additionally, phrases such as "after sunset" or "as the night sets in" can also be used as synonyms for "cool of the day". These phrases allow for a reader or listener to imagine a specific time of day, adding to the descriptive nature of the text.