The phrase "ease upon" typically means to reduce or lessen something gradually. There are several synonyms that can be used to convey this same idea. Some of these include ease back, taper off, wind down, slow down, and ease up. Each of these phrases suggests a gradual reduction in intensity or pace, whether it be related to physical activity, stress levels, or other factors. Using synonyms for "ease upon" allows for greater variety in writing and helps to avoid repetition. Additionally, choosing the right synonym can help to convey the intended meaning more clearly to readers.