The phrase "fade away" typically means to gradually disappear or lose strength or importance over time. There are a number of synonyms that can be used for this phrase, such as "disappear," "diminish," "vanish," "wane," "ebbe," "die out," "fizzle out," "lose strength," "peter out," and "tail off." Each of these synonyms conveys a similar meaning but may be used in slightly different contexts. For example, "disappear" is a more general term that can be used to describe anything that vanishes, whereas "diminish" is often used to describe a gradual decrease in strength or intensity.