When someone or something does not meet the expectations, we tend to use the phrase "fail to live up to the expectations of." However, there are numerous synonyms that one can use instead of this phrase. For instance, one can say "disappoint" or "let down," which imply that someone or something did not meet the expected standards. Another alternative is "fall short," which means that they did not accomplish what they had set out to do. "Miss the mark," "underperform," and "let expectations down" are also great alternatives to describe failing to meet the expectations of someone or something.